diff options
Diffstat (limited to 'third_party/libcxx/include/c++/v1/string')
| -rw-r--r-- | third_party/libcxx/include/c++/v1/string | 4041 |
1 files changed, 4041 insertions, 0 deletions
diff --git a/third_party/libcxx/include/c++/v1/string b/third_party/libcxx/include/c++/v1/string new file mode 100644 index 0000000..0c8767d --- /dev/null +++ b/third_party/libcxx/include/c++/v1/string @@ -0,0 +1,4041 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP_STRING +#define _LIBCPP_STRING + +// clang-format off + +/* + string synopsis + +#include <compare> +#include <initializer_list> + +namespace std +{ + +template <class stateT> +class fpos +{ +private: + stateT st; +public: + fpos(streamoff = streamoff()); + + operator streamoff() const; + + stateT state() const; + void state(stateT); + + fpos& operator+=(streamoff); + fpos operator+ (streamoff) const; + fpos& operator-=(streamoff); + fpos operator- (streamoff) const; +}; + +template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y); + +template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y); +template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y); + +template <class charT> +struct char_traits +{ + using char_type = charT; + using int_type = ...; + using off_type = streamoff; + using pos_type = streampos; + using state_type = mbstate_t; + using comparison_category = strong_ordering; // Since C++20 only for the specializations + // char, wchar_t, char8_t, char16_t, and char32_t. + + static void assign(char_type& c1, const char_type& c2) noexcept; + static constexpr bool eq(char_type c1, char_type c2) noexcept; + static constexpr bool lt(char_type c1, char_type c2) noexcept; + + static int compare(const char_type* s1, const char_type* s2, size_t n); + static size_t length(const char_type* s); + static const char_type* find(const char_type* s, size_t n, const char_type& a); + static char_type* move(char_type* s1, const char_type* s2, size_t n); + static char_type* copy(char_type* s1, const char_type* s2, size_t n); + static char_type* assign(char_type* s, size_t n, char_type a); + + static constexpr int_type not_eof(int_type c) noexcept; + static constexpr char_type to_char_type(int_type c) noexcept; + static constexpr int_type to_int_type(char_type c) noexcept; + static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; + static constexpr int_type eof() noexcept; +}; + +template <> struct char_traits<char>; +template <> struct char_traits<wchar_t>; +template <> struct char_traits<char8_t>; // C++20 +template <> struct char_traits<char16_t>; +template <> struct char_traits<char32_t>; + +template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > +class basic_string +{ +public: +// types: + typedef traits traits_type; + typedef typename traits_type::char_type value_type; + typedef Allocator allocator_type; + typedef typename allocator_type::size_type size_type; + typedef typename allocator_type::difference_type difference_type; + typedef typename allocator_type::reference reference; + typedef typename allocator_type::const_reference const_reference; + typedef typename allocator_type::pointer pointer; + typedef typename allocator_type::const_pointer const_pointer; + typedef implementation-defined iterator; + typedef implementation-defined const_iterator; + typedef std::reverse_iterator<iterator> reverse_iterator; + typedef std::reverse_iterator<const_iterator> const_reverse_iterator; + + static const size_type npos = -1; + + basic_string() + noexcept(is_nothrow_default_constructible<allocator_type>::value); // constexpr since C++20 + explicit basic_string(const allocator_type& a); // constexpr since C++20 + basic_string(const basic_string& str); // constexpr since C++20 + basic_string(basic_string&& str) + noexcept(is_nothrow_move_constructible<allocator_type>::value); // constexpr since C++20 + basic_string(const basic_string& str, size_type pos, + const allocator_type& a = allocator_type()); // constexpr since C++20 + basic_string(const basic_string& str, size_type pos, size_type n, + const Allocator& a = Allocator()); // constexpr since C++20 + constexpr basic_string( + basic_string&& str, size_type pos, const Allocator& a = Allocator()); // since C++23 + constexpr basic_string( + basic_string&& str, size_type pos, size_type n, const Allocator& a = Allocator()); // since C++23 + template<class T> + basic_string(const T& t, size_type pos, size_type n, const Allocator& a = Allocator()); // C++17, constexpr since C++20 + template <class T> + explicit basic_string(const T& t, const Allocator& a = Allocator()); // C++17, constexpr since C++20 + basic_string(const value_type* s, const allocator_type& a = allocator_type()); // constexpr since C++20 + basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type()); // constexpr since C++20 + basic_string(nullptr_t) = delete; // C++23 + basic_string(size_type n, value_type c, const allocator_type& a = allocator_type()); // constexpr since C++20 + template<class InputIterator> + basic_string(InputIterator begin, InputIterator end, + const allocator_type& a = allocator_type()); // constexpr since C++20 + template<container-compatible-range<charT> R> + constexpr basic_string(from_range_t, R&& rg, const Allocator& a = Allocator()); // since C++23 + basic_string(initializer_list<value_type>, const Allocator& = Allocator()); // constexpr since C++20 + basic_string(const basic_string&, const Allocator&); // constexpr since C++20 + basic_string(basic_string&&, const Allocator&); // constexpr since C++20 + + ~basic_string(); // constexpr since C++20 + + operator basic_string_view<charT, traits>() const noexcept; // constexpr since C++20 + + basic_string& operator=(const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& operator=(const T& t); // C++17, constexpr since C++20 + basic_string& operator=(basic_string&& str) + noexcept( + allocator_type::propagate_on_container_move_assignment::value || + allocator_type::is_always_equal::value ); // C++17, constexpr since C++20 + basic_string& operator=(const value_type* s); // constexpr since C++20 + basic_string& operator=(nullptr_t) = delete; // C++23 + basic_string& operator=(value_type c); // constexpr since C++20 + basic_string& operator=(initializer_list<value_type>); // constexpr since C++20 + + iterator begin() noexcept; // constexpr since C++20 + const_iterator begin() const noexcept; // constexpr since C++20 + iterator end() noexcept; // constexpr since C++20 + const_iterator end() const noexcept; // constexpr since C++20 + + reverse_iterator rbegin() noexcept; // constexpr since C++20 + const_reverse_iterator rbegin() const noexcept; // constexpr since C++20 + reverse_iterator rend() noexcept; // constexpr since C++20 + const_reverse_iterator rend() const noexcept; // constexpr since C++20 + + const_iterator cbegin() const noexcept; // constexpr since C++20 + const_iterator cend() const noexcept; // constexpr since C++20 + const_reverse_iterator crbegin() const noexcept; // constexpr since C++20 + const_reverse_iterator crend() const noexcept; // constexpr since C++20 + + size_type size() const noexcept; // constexpr since C++20 + size_type length() const noexcept; // constexpr since C++20 + size_type max_size() const noexcept; // constexpr since C++20 + size_type capacity() const noexcept; // constexpr since C++20 + + void resize(size_type n, value_type c); // constexpr since C++20 + void resize(size_type n); // constexpr since C++20 + + template<class Operation> + constexpr void resize_and_overwrite(size_type n, Operation op); // since C++23 + + void reserve(size_type res_arg); // constexpr since C++20 + void reserve(); // deprecated in C++20, removed in C++26 + void shrink_to_fit(); // constexpr since C++20 + void clear() noexcept; // constexpr since C++20 + bool empty() const noexcept; // constexpr since C++20 + + const_reference operator[](size_type pos) const; // constexpr since C++20 + reference operator[](size_type pos); // constexpr since C++20 + + const_reference at(size_type n) const; // constexpr since C++20 + reference at(size_type n); // constexpr since C++20 + + basic_string& operator+=(const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& operator+=(const T& t); // C++17, constexpr since C++20 + basic_string& operator+=(const value_type* s); // constexpr since C++20 + basic_string& operator+=(value_type c); // constexpr since C++20 + basic_string& operator+=(initializer_list<value_type>); // constexpr since C++20 + + basic_string& append(const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& append(const T& t); // C++17, constexpr since C++20 + basic_string& append(const basic_string& str, size_type pos, size_type n=npos); // C++14, constexpr since C++20 + template <class T> + basic_string& append(const T& t, size_type pos, size_type n=npos); // C++17, constexpr since C++20 + basic_string& append(const value_type* s, size_type n); // constexpr since C++20 + basic_string& append(const value_type* s); // constexpr since C++20 + basic_string& append(size_type n, value_type c); // constexpr since C++20 + template<class InputIterator> + basic_string& append(InputIterator first, InputIterator last); // constexpr since C++20 + template<container-compatible-range<charT> R> + constexpr basic_string& append_range(R&& rg); // C++23 + basic_string& append(initializer_list<value_type>); // constexpr since C++20 + + void push_back(value_type c); // constexpr since C++20 + void pop_back(); // constexpr since C++20 + reference front(); // constexpr since C++20 + const_reference front() const; // constexpr since C++20 + reference back(); // constexpr since C++20 + const_reference back() const; // constexpr since C++20 + + basic_string& assign(const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& assign(const T& t); // C++17, constexpr since C++20 + basic_string& assign(basic_string&& str); // constexpr since C++20 + basic_string& assign(const basic_string& str, size_type pos, size_type n=npos); // C++14, constexpr since C++20 + template <class T> + basic_string& assign(const T& t, size_type pos, size_type n=npos); // C++17, constexpr since C++20 + basic_string& assign(const value_type* s, size_type n); // constexpr since C++20 + basic_string& assign(const value_type* s); // constexpr since C++20 + basic_string& assign(size_type n, value_type c); // constexpr since C++20 + template<class InputIterator> + basic_string& assign(InputIterator first, InputIterator last); // constexpr since C++20 + template<container-compatible-range<charT> R> + constexpr basic_string& assign_range(R&& rg); // C++23 + basic_string& assign(initializer_list<value_type>); // constexpr since C++20 + + basic_string& insert(size_type pos1, const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& insert(size_type pos1, const T& t); // constexpr since C++20 + basic_string& insert(size_type pos1, const basic_string& str, + size_type pos2, size_type n2=npos); // constexpr since C++20 + template <class T> + basic_string& insert(size_type pos1, const T& t, size_type pos2, size_type n=npos); // C++17, constexpr since C++20 + basic_string& insert(size_type pos, const value_type* s, size_type n=npos); // C++14, constexpr since C++20 + basic_string& insert(size_type pos, const value_type* s); // constexpr since C++20 + basic_string& insert(size_type pos, size_type n, value_type c); // constexpr since C++20 + iterator insert(const_iterator p, value_type c); // constexpr since C++20 + iterator insert(const_iterator p, size_type n, value_type c); // constexpr since C++20 + template<class InputIterator> + iterator insert(const_iterator p, InputIterator first, InputIterator last); // constexpr since C++20 + template<container-compatible-range<charT> R> + constexpr iterator insert_range(const_iterator p, R&& rg); // C++23 + iterator insert(const_iterator p, initializer_list<value_type>); // constexpr since C++20 + + basic_string& erase(size_type pos = 0, size_type n = npos); // constexpr since C++20 + iterator erase(const_iterator position); // constexpr since C++20 + iterator erase(const_iterator first, const_iterator last); // constexpr since C++20 + + basic_string& replace(size_type pos1, size_type n1, const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& replace(size_type pos1, size_type n1, const T& t); // C++17, constexpr since C++20 + basic_string& replace(size_type pos1, size_type n1, const basic_string& str, + size_type pos2, size_type n2=npos); // C++14, constexpr since C++20 + template <class T> + basic_string& replace(size_type pos1, size_type n1, const T& t, + size_type pos2, size_type n2=npos); // C++17, constexpr since C++20 + basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2); // constexpr since C++20 + basic_string& replace(size_type pos, size_type n1, const value_type* s); // constexpr since C++20 + basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c); // constexpr since C++20 + basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str); // constexpr since C++20 + template <class T> + basic_string& replace(const_iterator i1, const_iterator i2, const T& t); // C++17, constexpr since C++20 + basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n); // constexpr since C++20 + basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s); // constexpr since C++20 + basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c); // constexpr since C++20 + template<class InputIterator> + basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2); // constexpr since C++20 + template<container-compatible-range<charT> R> + constexpr basic_string& replace_with_range(const_iterator i1, const_iterator i2, R&& rg); // C++23 + basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>); // constexpr since C++20 + + size_type copy(value_type* s, size_type n, size_type pos = 0) const; // constexpr since C++20 + basic_string substr(size_type pos = 0, size_type n = npos) const; // constexpr in C++20, removed in C++23 + basic_string substr(size_type pos = 0, size_type n = npos) const&; // since C++23 + constexpr basic_string substr(size_type pos = 0, size_type n = npos) &&; // since C++23 + constexpr basic_string_view<charT, traits> subview(size_type pos = 0, + size_type n = npos) const; // since C++26 + void swap(basic_string& str) + noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value || + allocator_traits<allocator_type>::is_always_equal::value); // C++17, constexpr since C++20 + + const value_type* c_str() const noexcept; // constexpr since C++20 + const value_type* data() const noexcept; // constexpr since C++20 + value_type* data() noexcept; // C++17, constexpr since C++20 + + allocator_type get_allocator() const noexcept; // constexpr since C++20 + + size_type find(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20 + template <class T> + size_type find(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type find(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type find(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20 + size_type find(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20 + + size_type rfind(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20 + template <class T> + size_type rfind(const T& t, size_type pos = npos) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type rfind(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type rfind(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20 + size_type rfind(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20 + + size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20 + template <class T> + size_type find_first_of(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type find_first_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type find_first_of(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20 + size_type find_first_of(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20 + + size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20 + template <class T> + size_type find_last_of(const T& t, size_type pos = npos) const noexcept noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type find_last_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type find_last_of(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20 + size_type find_last_of(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20 + + size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept; // constexpr since C++20 + template <class T> + size_type find_first_not_of(const T& t, size_type pos = 0) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type find_first_not_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type find_first_not_of(const value_type* s, size_type pos = 0) const noexcept; // constexpr since C++20 + size_type find_first_not_of(value_type c, size_type pos = 0) const noexcept; // constexpr since C++20 + + size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept; // constexpr since C++20 + template <class T> + size_type find_last_not_of(const T& t, size_type pos = npos) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + size_type find_last_not_of(const value_type* s, size_type pos, size_type n) const noexcept; // constexpr since C++20 + size_type find_last_not_of(const value_type* s, size_type pos = npos) const noexcept; // constexpr since C++20 + size_type find_last_not_of(value_type c, size_type pos = npos) const noexcept; // constexpr since C++20 + + int compare(const basic_string& str) const noexcept; // constexpr since C++20 + template <class T> + int compare(const T& t) const noexcept; // C++17, noexcept as an extension, constexpr since C++20 + int compare(size_type pos1, size_type n1, const basic_string& str) const; // constexpr since C++20 + template <class T> + int compare(size_type pos1, size_type n1, const T& t) const; // C++17, constexpr since C++20 + int compare(size_type pos1, size_type n1, const basic_string& str, + size_type pos2, size_type n2=npos) const; // C++14, constexpr since C++20 + template <class T> + int compare(size_type pos1, size_type n1, const T& t, + size_type pos2, size_type n2=npos) const; // C++17, constexpr since C++20 + int compare(const value_type* s) const noexcept; // constexpr since C++20 + int compare(size_type pos1, size_type n1, const value_type* s) const; // constexpr since C++20 + int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const; // constexpr since C++20 + + constexpr bool starts_with(basic_string_view<charT, traits> sv) const noexcept; // C++20 + constexpr bool starts_with(charT c) const noexcept; // C++20 + constexpr bool starts_with(const charT* s) const; // C++20 + constexpr bool ends_with(basic_string_view<charT, traits> sv) const noexcept; // C++20 + constexpr bool ends_with(charT c) const noexcept; // C++20 + constexpr bool ends_with(const charT* s) const; // C++20 + + constexpr bool contains(basic_string_view<charT, traits> sv) const noexcept; // C++23 + constexpr bool contains(charT c) const noexcept; // C++23 + constexpr bool contains(const charT* s) const; // C++23 +}; + +template<class InputIterator, + class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>> +basic_string(InputIterator, InputIterator, Allocator = Allocator()) + -> basic_string<typename iterator_traits<InputIterator>::value_type, + char_traits<typename iterator_traits<InputIterator>::value_type>, + Allocator>; // C++17 + +template<ranges::input_range R, + class Allocator = allocator<ranges::range_value_t<R>>> + basic_string(from_range_t, R&&, Allocator = Allocator()) + -> basic_string<ranges::range_value_t<R>, char_traits<ranges::range_value_t<R>>, + Allocator>; // C++23 + +template<class charT, + class traits, + class Allocator = allocator<charT>> + explicit basic_string(basic_string_view<charT, traits>, const Allocator& = Allocator()) + -> basic_string<charT, traits, Allocator>; // C++17 + +template<class charT, + class traits, + class Allocator = allocator<charT>> + basic_string(basic_string_view<charT, traits>, + typename see below::size_type, typename see below::size_type, + const Allocator& = Allocator()) + -> basic_string<charT, traits, Allocator>; // C++17 + +template<class charT, class traits, class Allocator> +basic_string<charT, traits, Allocator> +operator+(const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs); // constexpr since C++20 + +template<class charT, class traits, class Allocator> +basic_string<charT, traits, Allocator> +operator+(const charT* lhs , const basic_string<charT,traits,Allocator>&rhs); // constexpr since C++20 + +template<class charT, class traits, class Allocator> +basic_string<charT, traits, Allocator> +operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20 + +template<class charT, class traits, class Allocator> +basic_string<charT, traits, Allocator> +operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs); // constexpr since C++20 + +template<class charT, class traits, class Allocator> +basic_string<charT, traits, Allocator> +operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs); // constexpr since C++20 + +template<class charT, class traits, class Allocator> + constexpr basic_string<charT, traits, Allocator> + operator+(const basic_string<charT, traits, Allocator>& lhs, + type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26 +template<class charT, class traits, class Allocator> + constexpr basic_string<charT, traits, Allocator> + operator+(basic_string<charT, traits, Allocator>&& lhs, + type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26 +template<class charT, class traits, class Allocator> + constexpr basic_string<charT, traits, Allocator> + operator+(type_identity_t<basic_string_view<charT, traits>> lhs, + const basic_string<charT, traits, Allocator>& rhs); // Since C++26 +template<class charT, class traits, class Allocator> + constexpr basic_string<charT, traits, Allocator> + operator+(type_identity_t<basic_string_view<charT, traits>> lhs, + basic_string<charT, traits, Allocator>&& rhs); // Since C++26 + + +template<class charT, class traits, class Allocator> +bool operator==(const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // constexpr since C++20 + +template<class charT, class traits, class Allocator> +bool operator==(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator==(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs) noexcept; // constexpr since C++20 + +template<class charT, class traits, class Allocator> +bool operator!=(const basic_string<charT,traits,Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator< (const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator< (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator< (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator> (const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator> (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator> (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator<=(const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator<=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator<=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator>=(const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator>=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> +bool operator>=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept; // removed in C++20 + +template<class charT, class traits, class Allocator> // since C++20 +constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs, + const basic_string<charT, traits, Allocator>& rhs) noexcept; + +template<class charT, class traits, class Allocator> // since C++20 +constexpr see below operator<=>(const basic_string<charT, traits, Allocator>& lhs, + const charT* rhs) noexcept; + +template<class charT, class traits, class Allocator> +void swap(basic_string<charT, traits, Allocator>& lhs, + basic_string<charT, traits, Allocator>& rhs) + noexcept(noexcept(lhs.swap(rhs))); // constexpr since C++20 + +template<class charT, class traits, class Allocator> +basic_istream<charT, traits>& +operator>>(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str); + +template<class charT, class traits, class Allocator> +basic_ostream<charT, traits>& +operator<<(basic_ostream<charT, traits>& os, const basic_string<charT, traits, Allocator>& str); + +template<class charT, class traits, class Allocator> +basic_istream<charT, traits>& +getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str, + charT delim); + +template<class charT, class traits, class Allocator> +basic_istream<charT, traits>& +getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str); + +template<class charT, class traits, class Allocator, class U> +constexpr typename basic_string<charT, traits, Allocator>::size_type +erase(basic_string<charT, traits, Allocator>& c, const U& value); // C++20 +template<class charT, class traits, class Allocator, class Predicate> +constexpr typename basic_string<charT, traits, Allocator>::size_type +erase_if(basic_string<charT, traits, Allocator>& c, Predicate pred); // C++20 + +typedef basic_string<char> string; +typedef basic_string<wchar_t> wstring; +typedef basic_string<char8_t> u8string; // C++20 +typedef basic_string<char16_t> u16string; +typedef basic_string<char32_t> u32string; + +int stoi (const string& str, size_t* idx = nullptr, int base = 10); +long stol (const string& str, size_t* idx = nullptr, int base = 10); +unsigned long stoul (const string& str, size_t* idx = nullptr, int base = 10); +long long stoll (const string& str, size_t* idx = nullptr, int base = 10); +unsigned long long stoull(const string& str, size_t* idx = nullptr, int base = 10); + +float stof (const string& str, size_t* idx = nullptr); +double stod (const string& str, size_t* idx = nullptr); +long double stold(const string& str, size_t* idx = nullptr); + +string to_string(int val); +string to_string(unsigned val); +string to_string(long val); +string to_string(unsigned long val); +string to_string(long long val); +string to_string(unsigned long long val); +string to_string(float val); +string to_string(double val); +string to_string(long double val); + +int stoi (const wstring& str, size_t* idx = nullptr, int base = 10); +long stol (const wstring& str, size_t* idx = nullptr, int base = 10); +unsigned long stoul (const wstring& str, size_t* idx = nullptr, int base = 10); +long long stoll (const wstring& str, size_t* idx = nullptr, int base = 10); +unsigned long long stoull(const wstring& str, size_t* idx = nullptr, int base = 10); + +float stof (const wstring& str, size_t* idx = nullptr); +double stod (const wstring& str, size_t* idx = nullptr); +long double stold(const wstring& str, size_t* idx = nullptr); + +wstring to_wstring(int val); +wstring to_wstring(unsigned val); +wstring to_wstring(long val); +wstring to_wstring(unsigned long val); +wstring to_wstring(long long val); +wstring to_wstring(unsigned long long val); +wstring to_wstring(float val); +wstring to_wstring(double val); +wstring to_wstring(long double val); + +template <> struct hash<string>; +template <> struct hash<u8string>; // C++20 +template <> struct hash<u16string>; +template <> struct hash<u32string>; +template <> struct hash<wstring>; + +basic_string<char> operator""s( const char *str, size_t len ); // C++14, constexpr since C++20 +basic_string<wchar_t> operator""s( const wchar_t *str, size_t len ); // C++14, constexpr since C++20 +constexpr basic_string<char8_t> operator""s( const char8_t *str, size_t len ); // C++20 +basic_string<char16_t> operator""s( const char16_t *str, size_t len ); // C++14, constexpr since C++20 +basic_string<char32_t> operator""s( const char32_t *str, size_t len ); // C++14, constexpr since C++20 + +} // std + +*/ + +// clang-format on + +#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) +# include <__cxx03/string> +#else +# include <__algorithm/max.h> +# include <__algorithm/min.h> +# include <__algorithm/remove.h> +# include <__algorithm/remove_if.h> +# include <__assert> +# include <__config> +# include <__cstddef/size_t.h> +# include <__debug_utils/sanitizers.h> +# include <__format/enable_insertable.h> +# include <__functional/hash.h> +# include <__functional/is_transparent.h> +# include <__functional/unary_function.h> +# include <__fwd/string.h> +# include <__iterator/bounded_iter.h> +# include <__iterator/distance.h> +# include <__iterator/iterator_traits.h> +# include <__iterator/reverse_iterator.h> +# include <__iterator/wrap_iter.h> +# include <__memory/addressof.h> +# include <__memory/allocate_at_least.h> +# include <__memory/allocator.h> +# include <__memory/allocator_traits.h> +# include <__memory/compressed_pair.h> +# include <__memory/construct_at.h> +# include <__memory/noexcept_move_assign_container.h> +# include <__memory/pointer_traits.h> +# include <__memory/swap_allocator.h> +# include <__memory_resource/polymorphic_allocator.h> +# include <__ranges/access.h> +# include <__ranges/concepts.h> +# include <__ranges/container_compatible_range.h> +# include <__ranges/from_range.h> +# include <__string/char_traits.h> +# include <__string/extern_template_lists.h> +# include <__type_traits/conditional.h> +# include <__type_traits/desugars_to.h> +# include <__type_traits/enable_if.h> +# include <__type_traits/is_allocator.h> +# include <__type_traits/is_array.h> +# include <__type_traits/is_constant_evaluated.h> +# include <__type_traits/is_convertible.h> +# include <__type_traits/is_generic_transparent_comparator.h> +# include <__type_traits/is_nothrow_assignable.h> +# include <__type_traits/is_nothrow_constructible.h> +# include <__type_traits/is_same.h> +# include <__type_traits/is_standard_layout.h> +# include <__type_traits/is_trivially_constructible.h> +# include <__type_traits/is_trivially_copyable.h> +# include <__type_traits/is_trivially_relocatable.h> +# include <__type_traits/remove_cv.h> +# include <__type_traits/remove_cvref.h> +# include <__utility/default_three_way_comparator.h> +# include <__utility/exception_guard.h> +# include <__utility/forward.h> +# include <__utility/is_pointer_in_range.h> +# include <__utility/move.h> +# include <__utility/no_destroy.h> +# include <__utility/scope_guard.h> +# include <__utility/swap.h> +# include <climits> +# include <cstdio> // EOF +# include <cstring> +# include <limits> +# include <stdexcept> +# include <string_view> +# include <version> + +# if _LIBCPP_HAS_WIDE_CHARACTERS +# include <cwchar> +# endif + +// standard-mandated includes + +// [iterator.range] +# include <__iterator/access.h> +# include <__iterator/data.h> +# include <__iterator/empty.h> +# include <__iterator/reverse_access.h> +# include <__iterator/size.h> + +// [string.syn] +# include <compare> +# include <initializer_list> + +# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +# pragma GCC system_header +# endif + +_LIBCPP_PUSH_MACROS +# include <__undef_macros> + +// Since std::string is partially instantiated in the built library, we require that the library +// has been built with ASAN support in order to enable the container checks in std::string. +// Within the <string> implementation, use `_LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING` +// to determine whether ASAN container checks should be provided. +// +// The _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS macro disables ASAN instrumentation for a specific +// function, allowing memory accesses that would normally trigger ASan errors to proceed without +// crashing. This is useful for accessing parts of objects memory, which should not be accessed, +// such as unused bytes in short strings, that should never be accessed by other parts of the program. +# if _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS && _LIBCPP_INSTRUMENTED_WITH_ASAN +# define _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING 1 +# define _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS __attribute__((__no_sanitize__("address"))) +# else +# define _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING 0 +# define _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS +# endif + +_LIBCPP_BEGIN_NAMESPACE_STD + +// basic_string + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +__concatenate_strings(const _Allocator& __alloc, + __type_identity_t<basic_string_view<_CharT, _Traits> > __str1, + __type_identity_t<basic_string_view<_CharT, _Traits> > __str2); + +template <class _Iter> +inline const bool __string_is_trivial_iterator_v = false; + +template <class _Tp> +inline const bool __string_is_trivial_iterator_v<_Tp*> = is_arithmetic<_Tp>::value; + +template <class _Iter> +inline const bool __string_is_trivial_iterator_v<__wrap_iter<_Iter> > = __string_is_trivial_iterator_v<_Iter>; + +template <class _CharT, class _Traits, class _Tp> +inline const bool __can_be_converted_to_string_view_v = + is_convertible<const _Tp&, basic_string_view<_CharT, _Traits> >::value && + !is_convertible<const _Tp&, const _CharT*>::value; + +struct __uninitialized_size_tag {}; +struct __init_with_sentinel_tag {}; + +template <size_t _PaddingSize> +struct __padding { + char __padding_[_PaddingSize]; +}; + +template <> +struct __padding<0> {}; + +template <class _CharT, class _Traits, class _Allocator> +class basic_string { +public: + using __self _LIBCPP_NODEBUG = basic_string; + using __self_view _LIBCPP_NODEBUG = basic_string_view<_CharT, _Traits>; + using traits_type = _Traits; + using value_type = _CharT; + using allocator_type = _Allocator; + using __alloc_traits _LIBCPP_NODEBUG = allocator_traits<allocator_type>; + using size_type = typename __alloc_traits::size_type; + using difference_type = typename __alloc_traits::difference_type; + using reference = value_type&; + using const_reference = const value_type&; + using pointer = typename __alloc_traits::pointer; + using const_pointer = typename __alloc_traits::const_pointer; + + // A basic_string contains the following members which may be trivially relocatable: + // - pointer: is currently assumed to be trivially relocatable, but is still checked in case that changes + // - size_type: is always trivially relocatable, since it has to be an integral type + // - value_type: is always trivially relocatable, since it has to be trivial + // - unsigned char: is a fundamental type, so it's trivially relocatable + // - allocator_type: may or may not be trivially relocatable, so it's checked + // + // This string implementation doesn't contain any references into itself. It only contains a bit that says whether + // it is in small or large string mode, so the entire structure is trivially relocatable if its members are. +# if _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING + // When compiling with AddressSanitizer (ASan), basic_string cannot be trivially + // relocatable. Because the object's memory might be poisoned when its content + // is kept inside objects memory (short string optimization), instead of in allocated + // external memory. In such cases, the destructor is responsible for unpoisoning + // the memory to avoid triggering false positives. + // Therefore it's crucial to ensure the destructor is called. + using __trivially_relocatable _LIBCPP_NODEBUG = void; +# else + using __trivially_relocatable _LIBCPP_NODEBUG = __conditional_t< + __libcpp_is_trivially_relocatable<allocator_type>::value && __libcpp_is_trivially_relocatable<pointer>::value, + basic_string, + void>; +# endif + + static_assert(!is_array<value_type>::value, "Character type of basic_string must not be an array"); + static_assert(is_standard_layout<value_type>::value, "Character type of basic_string must be standard-layout"); + static_assert(is_trivially_default_constructible<value_type>::value, + "Character type of basic_string must be trivially default constructible"); + static_assert(is_trivially_copyable<value_type>::value, "Character type of basic_string must be trivially copyable"); + static_assert(is_same<_CharT, typename traits_type::char_type>::value, + "traits_type::char_type must be the same type as CharT"); + static_assert(is_same<typename allocator_type::value_type, value_type>::value, + "Allocator::value_type must be same type as value_type"); + static_assert(__check_valid_allocator<allocator_type>::value, ""); + +# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING + // Users might provide custom allocators, and prior to C++20 we have no existing way to detect whether the allocator's + // pointer type is contiguous (though it has to be by the Standard). Using the wrapper type ensures the iterator is + // considered contiguous. + using iterator = __bounded_iter<pointer>; + using const_iterator = __bounded_iter<const_pointer>; +# else + using iterator = __wrap_iter<pointer>; + using const_iterator = __wrap_iter<const_pointer>; +# endif + using reverse_iterator = std::reverse_iterator<iterator>; + using const_reverse_iterator = std::reverse_iterator<const_iterator>; + + using __alloc_result _LIBCPP_NODEBUG = __allocation_result<pointer, size_type>; + +private: + static_assert(CHAR_BIT == 8, "This implementation assumes that one byte contains 8 bits"); + +# ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT + + struct __long { + __long() = default; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __long(__alloc_result __alloc, size_type __size) + : __data_(__alloc.ptr), __size_(__size), __cap_(__alloc.count / __endian_factor), __is_long_(true) { + _LIBCPP_ASSERT_INTERNAL(!__fits_in_sso(__alloc.count), "Long capacity should always be larger than the SSO"); + } + + pointer __data_; + size_type __size_; + size_type __cap_ : sizeof(size_type) * CHAR_BIT - 1; + size_type __is_long_ : 1; + }; + + enum { __min_cap = (sizeof(__long) - 1) / sizeof(value_type) > 2 ? (sizeof(__long) - 1) / sizeof(value_type) : 2 }; + + struct __short { + value_type __data_[__min_cap]; + _LIBCPP_NO_UNIQUE_ADDRESS __padding<sizeof(value_type) - 1> __padding_; + unsigned char __size_ : 7; + unsigned char __is_long_ : 1; + }; + + // The __endian_factor is required because the field we use to store the size + // has one fewer bit than it would if it were not a bitfield. + // + // If the LSB is used to store the short-flag in the short string representation, + // we have to multiply the size by two when it is stored and divide it by two when + // it is loaded to make sure that we always store an even number. In the long string + // representation, we can ignore this because we can assume that we always allocate + // an even amount of value_types. + // + // If the MSB is used for the short-flag, the max_size() is numeric_limits<size_type>::max() / 2. + // This does not impact the short string representation, since we never need the MSB + // for representing the size of a short string anyway. + +# ifdef _LIBCPP_BIG_ENDIAN + static const size_type __endian_factor = 2; +# else + static const size_type __endian_factor = 1; +# endif + +# else // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT + +# ifdef _LIBCPP_BIG_ENDIAN + static const size_type __endian_factor = 1; +# else + static const size_type __endian_factor = 2; +# endif + + // Attribute 'packed' is used to keep the layout compatible with the + // previous definition that did not use bit fields. This is because on + // some platforms bit fields have a default size rather than the actual + // size used, e.g., it is 4 bytes on AIX. See D128285 for details. + struct __long { + __long() = default; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __long(__alloc_result __alloc, size_type __size) + : __is_long_(true), __cap_(__alloc.count / __endian_factor), __size_(__size), __data_(__alloc.ptr) { + _LIBCPP_ASSERT_INTERNAL(!__fits_in_sso(__alloc.count), "Long capacity should always be larger than the SSO"); + } + + struct _LIBCPP_PACKED { + size_type __is_long_ : 1; + size_type __cap_ : sizeof(size_type) * CHAR_BIT - 1; + }; + size_type __size_; + pointer __data_; + }; + + enum { __min_cap = (sizeof(__long) - 1) / sizeof(value_type) > 2 ? (sizeof(__long) - 1) / sizeof(value_type) : 2 }; + + struct __short { + struct _LIBCPP_PACKED { + unsigned char __is_long_ : 1; + unsigned char __size_ : 7; + }; + _LIBCPP_NO_UNIQUE_ADDRESS __padding<sizeof(value_type) - 1> __padding_; + value_type __data_[__min_cap]; + }; + +# endif // _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT + + static_assert(sizeof(__short) == (sizeof(value_type) * (__min_cap + 1)), "__short has an unexpected size."); + + union __rep { + __short __s; + __long __l; + + __rep() = default; + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep(__short __r) : __s(__r) {} + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep(__long __r) : __l(__r) {} + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep(__uninitialized_tag) {} + }; + + _LIBCPP_COMPRESSED_PAIR(__rep, __rep_, allocator_type, __alloc_); + + // annotate the string with its size() at scope exit. The string has to be in a valid state at that point. + struct __annotate_new_size { + basic_string& __str_; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __annotate_new_size(basic_string& __str) : __str_(__str) {} + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void operator()() { __str_.__annotate_new(__str_.size()); } + }; + + // Construct a string with the given allocator and enough storage to hold `__size` characters, but + // don't initialize the characters. The contents of the string, including the null terminator, must be + // initialized separately. + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string( + __uninitialized_size_tag, size_type __size, const allocator_type& __a) + : __alloc_(__a) { + __init_internal_buffer(__size); + } + + template <class _Iter, class _Sent> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(__init_with_sentinel_tag, _Iter __first, _Sent __last, const allocator_type& __a) + : __alloc_(__a) { + __init_with_sentinel(std::move(__first), std::move(__last)); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator __make_iterator(pointer __p) { +# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING + // Bound the iterator according to the size (and not the capacity, unlike vector). + // + // By the Standard, string iterators are generally not guaranteed to stay valid when the container is modified, + // regardless of whether reallocation occurs. This allows us to check for out-of-bounds accesses using logical size, + // a stricter check, since correct code can never rely on being able to access newly-added elements via an existing + // iterator. + return std::__make_bounded_iter(__p, __get_pointer(), __get_pointer() + size()); +# else + return iterator(__p); +# endif // _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator __make_const_iterator(const_pointer __p) const { +# ifdef _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING + // Bound the iterator according to the size (and not the capacity, unlike vector). + return std::__make_bounded_iter(__p, __get_pointer(), __get_pointer() + size()); +# else + return const_iterator(__p); +# endif // _LIBCPP_ABI_BOUNDED_ITERATORS_IN_STRING + } + +public: + _LIBCPP_TEMPLATE_DATA_VIS static const size_type npos = -1; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string() + _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value) +# if _LIBCPP_STD_VER >= 20 // TODO(LLVM 23): Remove this condition; this is a workaround for https://llvm.org/PR154567 + : __rep_(__short()) +# else + : __rep_() +# endif + { + __annotate_new(0); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const allocator_type& __a) +# if _LIBCPP_STD_VER <= 14 + _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value) +# else + _NOEXCEPT +# endif +# if _LIBCPP_STD_VER >= 20 // TODO(LLVM 23): Remove this condition; this is a workaround for https://llvm.org/PR154567 + : __rep_(__short()), +# else + : __rep_(), +# endif + __alloc_(__a) { + __annotate_new(0); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string(const basic_string& __str) + : __alloc_(__alloc_traits::select_on_container_copy_construction(__str.__alloc_)) { + if (!__str.__is_long()) { + __rep_ = __str.__rep_; + __annotate_new(__get_short_size()); + } else + __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size()); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS + basic_string(const basic_string& __str, const allocator_type& __a) + : __alloc_(__a) { + if (!__str.__is_long()) { + __rep_ = __str.__rep_; + __annotate_new(__get_short_size()); + } else + __init_copy_ctor_external(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size()); + } + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(basic_string&& __str) +# if _LIBCPP_STD_VER <= 14 + _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value) +# else + _NOEXCEPT +# endif + // Turning off ASan instrumentation for variable initialization with _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS + // does not work consistently during initialization of __r_, so we instead unpoison __str's memory manually first. + // __str's memory needs to be unpoisoned only in the case where it's a short string. + : __rep_([](basic_string& __s) -> decltype(__s.__rep_)&& { + if (!__s.__is_long()) + __s.__annotate_delete(); + return std::move(__s.__rep_); + }(__str)), + __alloc_(std::move(__str.__alloc_)) { + __str.__rep_ = __rep(); + __str.__annotate_new(0); + if (!__is_long()) + __annotate_new(size()); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(basic_string&& __str, const allocator_type& __a) + : __alloc_(__a) { + if (__str.__is_long() && __a != __str.__alloc_) // copy, not move + __init(std::__to_address(__str.__get_long_pointer()), __str.__get_long_size()); + else { + if (__libcpp_is_constant_evaluated()) + __rep_ = __rep(); + if (!__str.__is_long()) + __str.__annotate_delete(); + __rep_ = __str.__rep_; + __str.__rep_ = __rep(); + __str.__annotate_new(0); + if (!__is_long() && this != std::addressof(__str)) + __annotate_new(size()); + } + } +# endif // _LIBCPP_CXX03_LANG + + template <__enable_if_t<__is_allocator_v<_Allocator>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* _LIBCPP_DIAGNOSE_NULLPTR __s) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "basic_string(const char*) detected nullptr"); + __init(__s, traits_type::length(__s)); + } + + template <__enable_if_t<__is_allocator_v<_Allocator>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(const _CharT* _LIBCPP_DIAGNOSE_NULLPTR __s, const _Allocator& __a) + : __alloc_(__a) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "basic_string(const char*, allocator) detected nullptr"); + __init(__s, traits_type::length(__s)); + } + +# if _LIBCPP_STD_VER >= 23 + basic_string(nullptr_t) = delete; +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(const _CharT* __s, size_type __n) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "basic_string(const char*, n) detected nullptr"); + __init(__s, __n); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(const _CharT* __s, size_type __n, const _Allocator& __a) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") + : __alloc_(__a) { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "basic_string(const char*, n, allocator) detected nullptr"); + __init(__s, __n); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c) { __init(__n, __c); } + +# if _LIBCPP_STD_VER >= 23 + _LIBCPP_HIDE_FROM_ABI constexpr basic_string( + basic_string&& __str, size_type __pos, const _Allocator& __alloc = _Allocator()) + : basic_string(std::move(__str), __pos, npos, __alloc) {} + + _LIBCPP_HIDE_FROM_ABI constexpr basic_string( + basic_string&& __str, size_type __pos, size_type __n, const _Allocator& __alloc = _Allocator()) + : __alloc_(__alloc) { + if (__pos > __str.size()) + this->__throw_out_of_range(); + + auto __len = std::min<size_type>(__n, __str.size() - __pos); + if (__alloc_traits::is_always_equal::value || __alloc == __str.__alloc_) { + __move_assign(std::move(__str), __pos, __len); + } else { + // Perform a copy because the allocators are not compatible. + __init(__str.data() + __pos, __len); + } + } +# endif + + template <__enable_if_t<__is_allocator_v<_Allocator>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(size_type __n, _CharT __c, const _Allocator& __a) + : __alloc_(__a) { + __init(__n, __c); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Allocator& __a = _Allocator()) + : __alloc_(__a) { + size_type __str_sz = __str.size(); + if (__pos > __str_sz) + this->__throw_out_of_range(); + __init(__str.data() + __pos, std::min(__n, __str_sz - __pos)); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(const basic_string& __str, size_type __pos, const _Allocator& __a = _Allocator()) + : __alloc_(__a) { + size_type __str_sz = __str.size(); + if (__pos > __str_sz) + this->__throw_out_of_range(); + __init(__str.data() + __pos, __str_sz - __pos); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(const _Tp& __t, size_type __pos, size_type __n, const allocator_type& __a = allocator_type()) + : __alloc_(__a) { + __self_view __sv0 = __t; + __self_view __sv = __sv0.substr(__pos, __n); + __init(__sv.data(), __sv.size()); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const _Tp& __t) { + __self_view __sv = __t; + __init(__sv.data(), __sv.size()); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit basic_string(const _Tp& __t, const allocator_type& __a) + : __alloc_(__a) { + __self_view __sv = __t; + __init(__sv.data(), __sv.size()); + } + + template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(_InputIterator __first, _InputIterator __last) { + __init(__first, __last); + } + + template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 + basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a) + : __alloc_(__a) { + __init(__first, __last); + } + +# if _LIBCPP_STD_VER >= 23 + template <_ContainerCompatibleRange<_CharT> _Range> + _LIBCPP_HIDE_FROM_ABI constexpr basic_string( + from_range_t, _Range&& __range, const allocator_type& __a = allocator_type()) + : __alloc_(__a) { + if constexpr (ranges::forward_range<_Range> || ranges::sized_range<_Range>) { + __init_with_size(ranges::begin(__range), ranges::end(__range), ranges::distance(__range)); + } else { + __init_with_sentinel(ranges::begin(__range), ranges::end(__range)); + } + } +# endif + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(initializer_list<_CharT> __il) { + __init(__il.begin(), __il.end()); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string(initializer_list<_CharT> __il, const _Allocator& __a) + : __alloc_(__a) { + __init(__il.begin(), __il.end()); + } +# endif // _LIBCPP_CXX03_LANG + + // TODO(boomanaiden154): Once we mark this in destructors as dead on return, + // we can use a normal call to __reset_internal_buffer and remove the extra + // __rep constructor. + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 ~basic_string() { __reset_internal_buffer(__rep(__uninitialized_tag())); } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 operator __self_view() const _NOEXCEPT { + return __self_view(typename __self_view::__assume_valid(), data(), size()); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string& + operator=(const basic_string& __str); + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(const _Tp& __t) { + __self_view __sv = __t; + return assign(__sv); + } + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + operator=(basic_string&& __str) noexcept(__noexcept_move_assign_container<_Allocator, __alloc_traits>::value) { + __move_assign(__str, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>()); + return *this; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(initializer_list<value_type> __il) { + return assign(__il.begin(), __il.size()); + } +# endif + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + operator=(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) { + return assign(__s); + } +# if _LIBCPP_STD_VER >= 23 + basic_string& operator=(nullptr_t) = delete; +# endif + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator=(value_type __c); + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator begin() _NOEXCEPT { + return __make_iterator(__get_pointer()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator begin() const _NOEXCEPT { + return __make_const_iterator(__get_pointer()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator end() _NOEXCEPT { + return __make_iterator(__get_pointer() + size()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator end() const _NOEXCEPT { + return __make_const_iterator(__get_pointer() + size()); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reverse_iterator rbegin() _NOEXCEPT { + return reverse_iterator(end()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator + rbegin() const _NOEXCEPT { + return const_reverse_iterator(end()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reverse_iterator rend() _NOEXCEPT { + return reverse_iterator(begin()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator rend() const _NOEXCEPT { + return const_reverse_iterator(begin()); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator cbegin() const _NOEXCEPT { + return begin(); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_iterator cend() const _NOEXCEPT { + return end(); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator + crbegin() const _NOEXCEPT { + return rbegin(); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reverse_iterator crend() const _NOEXCEPT { + return rend(); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type size() const _NOEXCEPT { + return __is_long() ? __get_long_size() : __get_short_size(); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type length() const _NOEXCEPT { + return size(); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type max_size() const _NOEXCEPT { + if (size_type __m = __alloc_traits::max_size(__alloc_); __m <= std::numeric_limits<size_type>::max() / 2) { + size_type __res = __m - __alignment; + + // When the __endian_factor == 2, our string representation assumes that the capacity + // (including the null terminator) is always even, so we have to make sure the lowest bit isn't set when the + // string grows to max_size() + if (__endian_factor == 2) + __res &= ~size_type(1); + + // We have to allocate space for the null terminator, but max_size() doesn't include it. + return __res - 1; + } else { + bool __uses_lsb = __endian_factor == 2; + return __uses_lsb ? __m - __alignment - 1 : (__m / 2) - __alignment - 1; + } + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type capacity() const _NOEXCEPT { + return (__is_long() ? __get_long_cap() : static_cast<size_type>(__min_cap)) - 1; + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n, value_type __c); + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void resize(size_type __n) { resize(__n, value_type()); } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 void reserve(size_type __requested_capacity); + +# if _LIBCPP_STD_VER >= 23 + template <class _Op> + _LIBCPP_HIDE_FROM_ABI constexpr void resize_and_overwrite(size_type __n, _Op __op) { + using __result_type = decltype(std::move(__op)(data(), auto(__n))); + static_assert(__integer_like<__result_type>, "Operation return type must be integer-like"); + size_type __sz = size(); + size_type __cap = capacity(); + if (__n > __cap) + __grow_by_without_replace(__cap, __n - __cap, __sz, __sz, 0); + __annotate_delete(); + __set_size(__n); + __annotate_new(__n); + __erase_to_end(std::move(__op)(data(), auto(__n))); + } +# endif + +# if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_STRING_RESERVE) + _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void reserve() _NOEXCEPT { shrink_to_fit(); } +# endif + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void shrink_to_fit() _NOEXCEPT; + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void clear() _NOEXCEPT; + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool empty() const _NOEXCEPT { + return size() == 0; + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference + operator[](size_type __pos) const _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos <= size(), "string index out of bounds"); + if (__builtin_constant_p(__pos) && !__fits_in_sso(__pos)) { + return *(__get_long_pointer() + __pos); + } + return *(data() + __pos); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference + operator[](size_type __pos) _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__pos <= size(), "string index out of bounds"); + if (__builtin_constant_p(__pos) && !__fits_in_sso(__pos)) { + return *(__get_long_pointer() + __pos); + } + return *(__get_pointer() + __pos); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference at(size_type __n) const; + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 reference at(size_type __n); + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(const basic_string& __str) { + return append(__str); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string >::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(const _Tp& __t) { + __self_view __sv = __t; + return append(__sv); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + operator+=(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) { + return append(__s); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(value_type __c) { + push_back(__c); + return *this; + } + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& operator+=(initializer_list<value_type> __il) { + return append(__il); + } +# endif // _LIBCPP_CXX03_LANG + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const basic_string& __str) { + return append(__str.data(), __str.size()); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const _Tp& __t) { + __self_view __sv = __t; + return append(__sv.data(), __sv.size()); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const basic_string& __str, size_type __pos, size_type __n = npos); + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + append(const _Tp& __t, size_type __pos, size_type __n = npos) { + __self_view __sv = __t; + size_type __sz = __sv.size(); + if (__pos > __sz) + __throw_out_of_range(); + return append(__sv.data() + __pos, std::min(__n, __sz - __pos)); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* __s, size_type __n) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero"); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(size_type __n, value_type __c); + + template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + append(_InputIterator __first, _InputIterator __last) { + const basic_string __temp(__first, __last, __alloc_); + append(__temp.data(), __temp.size()); + return *this; + } + + template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + append(_ForwardIterator __first, _ForwardIterator __last) { + size_type __sz = size(); + size_type __cap = capacity(); + size_type __n = static_cast<size_type>(std::distance(__first, __last)); + if (__n == 0) + return *this; + + if (__string_is_trivial_iterator_v<_ForwardIterator> && !__addr_in_range(*__first)) { + if (__cap - __sz < __n) + __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __sz, 0); + __annotate_increase(__n); + auto __end = __copy_non_overlapping_range(__first, __last, __data() + __sz); + traits_type::assign(*__end, value_type()); + __set_size(__sz + __n); + return *this; + } else { + const basic_string __temp(__first, __last, __alloc_); + return append(__temp.data(), __temp.size()); + } + } + +# if _LIBCPP_STD_VER >= 23 + template <_ContainerCompatibleRange<_CharT> _Range> + _LIBCPP_HIDE_FROM_ABI constexpr basic_string& append_range(_Range&& __range) { + insert_range(end(), std::forward<_Range>(__range)); + return *this; + } +# endif + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& append(initializer_list<value_type> __il) { + return append(__il.begin(), __il.size()); + } +# endif // _LIBCPP_CXX03_LANG + + _LIBCPP_CONSTEXPR_SINCE_CXX20 void push_back(value_type __c); + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void pop_back(); + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference front() _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::front(): string is empty"); + return *__get_pointer(); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference front() const _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::front(): string is empty"); + return *data(); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference back() _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::back(): string is empty"); + return *(__get_pointer() + size() - 1); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference back() const _NOEXCEPT { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::back(): string is empty"); + return *(data() + size() - 1); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const _Tp& __t) { + __self_view __sv = __t; + return assign(__sv.data(), __sv.size()); + } + +# if _LIBCPP_STD_VER >= 20 + _LIBCPP_HIDE_FROM_ABI constexpr void __move_assign(basic_string&& __str, size_type __pos, size_type __len) { + // Pilfer the allocation from __str. + _LIBCPP_ASSERT_INTERNAL(__alloc_ == __str.__alloc_, "__move_assign called with wrong allocator"); + size_type __old_sz = __str.size(); + if (!__str.__is_long()) + __str.__annotate_delete(); + __rep_ = __str.__rep_; + __str.__rep_ = __rep(); + __str.__annotate_new(0); + + _Traits::move(data(), data() + __pos, __len); + __set_size(__len); + _Traits::assign(data()[__len], value_type()); + + if (!__is_long()) { + __annotate_new(__len); + } else if (__old_sz > __len) { + __annotate_shrink(__old_sz); + } + } +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const basic_string& __str) { + return *this = __str; + } +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + assign(basic_string&& __str) noexcept(__noexcept_move_assign_container<_Allocator, __alloc_traits>::value) { + *this = std::move(__str); + return *this; + } +# endif + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const basic_string& __str, size_type __pos, size_type __n = npos); + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + assign(const _Tp& __t, size_type __pos, size_type __n = npos) { + __self_view __sv = __t; + size_type __sz = __sv.size(); + if (__pos > __sz) + __throw_out_of_range(); + return assign(__sv.data() + __pos, std::min(__n, __sz - __pos)); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* __s, size_type __n) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero"); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(size_type __n, value_type __c); + + template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + assign(_InputIterator __first, _InputIterator __last) { + __assign_with_sentinel(__first, __last); + return *this; + } + + template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + assign(_ForwardIterator __first, _ForwardIterator __last) { + if (__string_is_trivial_iterator_v<_ForwardIterator>) { + size_type __n = static_cast<size_type>(std::distance(__first, __last)); + __assign_trivial(__first, __last, __n); + } else { + __assign_with_sentinel(__first, __last); + } + + return *this; + } + +# if _LIBCPP_STD_VER >= 23 + template <_ContainerCompatibleRange<_CharT> _Range> + _LIBCPP_HIDE_FROM_ABI constexpr basic_string& assign_range(_Range&& __range) { + if constexpr (__string_is_trivial_iterator_v<ranges::iterator_t<_Range>> && + (ranges::forward_range<_Range> || ranges::sized_range<_Range>)) { + size_type __n = static_cast<size_type>(ranges::distance(__range)); + __assign_trivial(ranges::begin(__range), ranges::end(__range), __n); + + } else { + __assign_with_sentinel(ranges::begin(__range), ranges::end(__range)); + } + + return *this; + } +# endif + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& assign(initializer_list<value_type> __il) { + return assign(__il.begin(), __il.size()); + } +# endif // _LIBCPP_CXX03_LANG + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + insert(size_type __pos1, const basic_string& __str) { + return insert(__pos1, __str.data(), __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos1, const _Tp& __t) { + __self_view __sv = __t; + return insert(__pos1, __sv.data(), __sv.size()); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + insert(size_type __pos1, const _Tp& __t, size_type __pos2, size_type __n = npos) { + __self_view __sv = __t; + size_type __str_sz = __sv.size(); + if (__pos2 > __str_sz) + __throw_out_of_range(); + return insert(__pos1, __sv.data() + __pos2, std::min(__n, __str_sz - __pos2)); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n = npos); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* __s, size_type __n) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero"); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& insert(size_type __pos, size_type __n, value_type __c); + _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator insert(const_iterator __pos, value_type __c); + +# if _LIBCPP_STD_VER >= 23 + template <_ContainerCompatibleRange<_CharT> _Range> + _LIBCPP_HIDE_FROM_ABI constexpr iterator insert_range(const_iterator __position, _Range&& __range) { + if constexpr (ranges::forward_range<_Range> || ranges::sized_range<_Range>) { + auto __n = static_cast<size_type>(ranges::distance(__range)); + return __insert_with_size(__position, ranges::begin(__range), ranges::end(__range), __n); + + } else { + basic_string __temp(from_range, std::forward<_Range>(__range), __alloc_); + return insert(__position, __temp.data(), __temp.data() + __temp.size()); + } + } +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator + insert(const_iterator __pos, size_type __n, value_type __c) { + difference_type __p = __pos - begin(); + insert(static_cast<size_type>(__p), __n, __c); + return begin() + __p; + } + + template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator + insert(const_iterator __pos, _InputIterator __first, _InputIterator __last) { + const basic_string __temp(__first, __last, __alloc_); + return insert(__pos, __temp.data(), __temp.data() + __temp.size()); + } + + template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator + insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last) { + auto __n = static_cast<size_type>(std::distance(__first, __last)); + return __insert_with_size(__pos, __first, __last, __n); + } + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator + insert(const_iterator __pos, initializer_list<value_type> __il) { + return insert(__pos, __il.begin(), __il.end()); + } +# endif // _LIBCPP_CXX03_LANG + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& erase(size_type __pos = 0, size_type __n = npos); + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator erase(const_iterator __pos); + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator erase(const_iterator __first, const_iterator __last); + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos1, size_type __n1, const basic_string& __str) { + return replace(__pos1, __n1, __str.data(), __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos1, size_type __n1, const _Tp& __t) { + __self_view __sv = __t; + return replace(__pos1, __n1, __sv.data(), __sv.size()); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos); + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos) { + __self_view __sv = __t; + size_type __str_sz = __sv.size(); + if (__pos2 > __str_sz) + __throw_out_of_range(); + return replace(__pos1, __n1, __sv.data() + __pos2, std::min(__n2, __str_sz - __pos2)); + } + + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2) + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n2 != 0 && __s == nullptr, " if n2 is not zero"); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(size_type __pos, size_type __n1, const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s); + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c); + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, const basic_string& __str) { + return replace( + static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __str.data(), __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, const _Tp& __t) { + __self_view __sv = __t; + return replace(__i1 - begin(), __i2 - __i1, __sv); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n) { + return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s, __n); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, const value_type* __s) { + return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c) { + return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c); + } + + template <class _InputIterator, __enable_if_t<__has_input_iterator_category<_InputIterator>::value, int> = 0> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2) { + const basic_string __temp(__j1, __j2, __alloc_); + return replace(__i1, __i2, __temp); + } + +# if _LIBCPP_STD_VER >= 23 + template <_ContainerCompatibleRange<_CharT> _Range> + _LIBCPP_HIDE_FROM_ABI constexpr basic_string& + replace_with_range(const_iterator __i1, const_iterator __i2, _Range&& __range) { + basic_string __temp(from_range, std::forward<_Range>(__range), __alloc_); + return replace(__i1, __i2, __temp); + } +# endif + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il) { + return replace(__i1, __i2, __il.begin(), __il.end()); + } +# endif // _LIBCPP_CXX03_LANG + + _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const; + +# if _LIBCPP_STD_VER <= 20 + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI + _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string substr(size_type __pos = 0, size_type __n = npos) const { + return basic_string(*this, __pos, __n); + } +# else + [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr basic_string substr(size_type __pos = 0, size_type __n = npos) const& { + return basic_string(*this, __pos, __n); + } + + [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr basic_string substr(size_type __pos = 0, size_type __n = npos) && { + return basic_string(std::move(*this), __pos, __n); + } +# endif +# if _LIBCPP_STD_VER >= 26 + [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr __self_view subview(size_type __pos = 0, size_type __n = npos) const { + return __self_view(*this).subview(__pos, __n); + } +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(basic_string& __str) +# if _LIBCPP_STD_VER >= 14 + _NOEXCEPT; +# else + _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || __is_nothrow_swappable_v<allocator_type>); +# endif + + // [string.ops] + // ------------ + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const value_type* c_str() const _NOEXCEPT { + return data(); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const value_type* data() const _NOEXCEPT { + return std::__to_address(__get_pointer()); + } +# if _LIBCPP_STD_VER >= 17 + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 value_type* data() _NOEXCEPT { + return std::__to_address(__get_pointer()); + } +# endif + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const value_type* __data() const _NOEXCEPT { + return std::__to_address(__get_pointer()); + } + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 value_type* __data() _NOEXCEPT { + return std::__to_address(__get_pointer()); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 allocator_type get_allocator() const _NOEXCEPT { + return __alloc_; + } + + // find + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT { + return find(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT { + __self_view __sv = __t; + return find(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find(): received nullptr"); + return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = 0) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find(): received nullptr"); + return find(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT { + return std::__str_find<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); + } + + // rfind + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT { + return rfind(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + rfind(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT { + __self_view __sv = __t; + return rfind(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::rfind(): received nullptr"); + return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + rfind(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = npos) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::rfind(): received nullptr"); + return rfind(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + rfind(value_type __c, size_type __pos = npos) const _NOEXCEPT { + return std::__str_rfind<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); + } + + // find_first_of + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT { + return find_first_of(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT { + __self_view __sv = __t; + return find_first_of(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_first_of(): received nullptr"); + return std::__str_find_first_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_of(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = 0) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_first_of(): received nullptr"); + return find_first_of(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_of(value_type __c, size_type __pos = 0) const _NOEXCEPT { + return find(__c, __pos); + } + + // find_last_of + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT { + return find_last_of(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT { + __self_view __sv = __t; + return find_last_of(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_last_of(): received nullptr"); + return std::__str_find_last_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_of(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = npos) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_last_of(): received nullptr"); + return find_last_of(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_of(value_type __c, size_type __pos = npos) const _NOEXCEPT { + return rfind(__c, __pos); + } + + // find_first_not_of + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT { + return find_first_not_of(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_not_of(const _Tp& __t, size_type __pos = 0) const _NOEXCEPT { + __self_view __sv = __t; + return find_first_not_of(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_first_not_of(): received nullptr"); + return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_not_of(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = 0) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_first_not_of(): received nullptr"); + return find_first_not_of(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_first_not_of(value_type __c, size_type __pos = 0) const _NOEXCEPT { + return std::__str_find_first_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); + } + + // find_last_not_of + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT { + return find_last_not_of(__str.data(), __pos, __str.size()); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_not_of(const _Tp& __t, size_type __pos = npos) const _NOEXCEPT { + __self_view __sv = __t; + return find_last_not_of(__sv.data(), __pos, __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n != 0 && __s == nullptr, " if n is not zero") { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::find_last_not_of(): received nullptr"); + return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __s, __pos, __n); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_not_of(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s, size_type __pos = npos) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::find_last_not_of(): received nullptr"); + return find_last_not_of(__s, __pos, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + find_last_not_of(value_type __c, size_type __pos = npos) const _NOEXCEPT { + return std::__str_find_last_not_of<value_type, size_type, traits_type, npos>(data(), size(), __c, __pos); + } + + // compare + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(const basic_string& __str) const _NOEXCEPT { + return compare(__self_view(__str)); + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int compare(const _Tp& __t) const _NOEXCEPT { + __self_view __sv = __t; + size_t __lhs_sz = size(); + size_t __rhs_sz = __sv.size(); + int __result = traits_type::compare(data(), __sv.data(), std::min(__lhs_sz, __rhs_sz)); + if (__result != 0) + return __result; + if (__lhs_sz < __rhs_sz) + return -1; + if (__lhs_sz > __rhs_sz) + return 1; + return 0; + } + + template <class _Tp, __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp>, int> = 0> + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const _Tp& __t) const { + __self_view __sv = __t; + return compare(__pos1, __n1, __sv.data(), __sv.size()); + } + + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const basic_string& __str) const { + return compare(__pos1, __n1, __str.data(), __str.size()); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) const { + return compare(__pos1, __n1, __self_view(__str), __pos2, __n2); + } + + template <class _Tp, + __enable_if_t<__can_be_converted_to_string_view_v<_CharT, _Traits, _Tp> && + !is_same<__remove_cvref_t<_Tp>, basic_string>::value, + int> = 0> + [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const _Tp& __t, size_type __pos2, size_type __n2 = npos) const { + __self_view __sv = __t; + return __self_view(*this).substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) const _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::compare(): received nullptr"); + return compare(0, npos, __s, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) const { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::compare(): received nullptr"); + return compare(__pos1, __n1, __s, traits_type::length(__s)); + } + + [[__nodiscard__]] _LIBCPP_CONSTEXPR_SINCE_CXX20 int + compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const + _LIBCPP_DIAGNOSE_NULLPTR_IF(__n2 != 0 && __s == nullptr, " if n2 is not zero"); + + // starts_with + +# if _LIBCPP_STD_VER >= 20 + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(__self_view __sv) const noexcept { + return __self_view(typename __self_view::__assume_valid(), data(), size()).starts_with(__sv); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool starts_with(value_type __c) const noexcept { + return !empty() && _Traits::eq(front(), __c); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool + starts_with(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) const noexcept { + return starts_with(__self_view(__s)); + } + + // ends_with + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(__self_view __sv) const noexcept { + return __self_view(typename __self_view::__assume_valid(), data(), size()).ends_with(__sv); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool ends_with(value_type __c) const noexcept { + return !empty() && _Traits::eq(back(), __c); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool + ends_with(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) const noexcept { + return ends_with(__self_view(__s)); + } +# endif + + // contains + +# if _LIBCPP_STD_VER >= 23 + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool contains(__self_view __sv) const noexcept { + return __self_view(typename __self_view::__assume_valid(), data(), size()).contains(__sv); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool contains(value_type __c) const noexcept { + return __self_view(typename __self_view::__assume_valid(), data(), size()).contains(__c); + } + + [[__nodiscard__]] constexpr _LIBCPP_HIDE_FROM_ABI bool + contains(const value_type* _LIBCPP_DIAGNOSE_NULLPTR __s) const { + return __self_view(typename __self_view::__assume_valid(), data(), size()).contains(__s); + } +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __invariants() const; + +private: + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS bool + __is_long() const _NOEXCEPT { + if (__libcpp_is_constant_evaluated() && __builtin_constant_p(__rep_.__l.__is_long_)) { + return __rep_.__l.__is_long_; + } + return __rep_.__s.__is_long_; + } + + _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI static bool __fits_in_sso(size_type __sz) { return __sz < __min_cap; } + + template <class _Iterator, class _Sentinel> + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void + __assign_trivial(_Iterator __first, _Sentinel __last, size_type __n); + + template <class _Iterator, class _Sentinel> + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __assign_with_sentinel(_Iterator __first, _Sentinel __last); + + // Copy [__first, __last) into [__dest, __dest + (__last - __first)). Assumes that the ranges don't overlap. + template <class _ForwardIter, class _Sent> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static value_type* + __copy_non_overlapping_range(_ForwardIter __first, _Sent __last, value_type* __dest) { +# ifndef _LIBCPP_CXX03_LANG + if constexpr (__libcpp_is_contiguous_iterator<_ForwardIter>::value && + is_same<value_type, __remove_cvref_t<decltype(*__first)>>::value && + is_same<_ForwardIter, _Sent>::value) { + _LIBCPP_ASSERT_INTERNAL( + !std::__is_overlapping_range(std::__to_address(__first), std::__to_address(__last), __dest), + "__copy_non_overlapping_range called with an overlapping range!"); + traits_type::copy(__dest, std::__to_address(__first), __last - __first); + return __dest + (__last - __first); + } +# endif + + for (; __first != __last; ++__first) + traits_type::assign(*__dest++, *__first); + return __dest; + } + + template <class _ForwardIterator, class _Sentinel> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 iterator + __insert_from_safe_copy(size_type __n, size_type __ip, _ForwardIterator __first, _Sentinel __last) { + size_type __sz = size(); + size_type __cap = capacity(); + value_type* __p; + if (__cap - __sz >= __n) { + __annotate_increase(__n); + __p = __data(); + size_type __n_move = __sz - __ip; + if (__n_move != 0) + traits_type::move(__p + __ip + __n, __p + __ip, __n_move); + } else { + __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __ip, 0, __n); + __p = std::__to_address(__get_long_pointer()); + } + __sz += __n; + __set_size(__sz); + traits_type::assign(__p[__sz], value_type()); + __copy_non_overlapping_range(std::move(__first), std::move(__last), __p + __ip); + + return begin() + __ip; + } + + template <class _Iterator, class _Sentinel> + _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator + __insert_with_size(const_iterator __pos, _Iterator __first, _Sentinel __last, size_type __n); + + // internal buffer accessors + // ------------------------- + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void + __set_short_size(size_type __s) _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(__s < __min_cap, "__s should never be greater than or equal to the short string capacity"); + __rep_.__s.__size_ = __s; + __rep_.__s.__is_long_ = false; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS size_type + __get_short_size() const _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(!__rep_.__s.__is_long_, "String has to be short when trying to get the short size"); + __annotate_memory_barrier(); + return __rep_.__s.__size_; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_long_size(size_type __s) _NOEXCEPT { + __rep_.__l.__size_ = __s; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __get_long_size() const _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(__rep_.__l.__is_long_, "String has to be long when trying to get the long size"); + __annotate_memory_barrier(); + return __rep_.__l.__size_; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __set_size(size_type __s) _NOEXCEPT { + if (__is_long()) + __set_long_size(__s); + else + __set_short_size(__s); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __get_long_cap() const _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(__rep_.__l.__is_long_, "String has to be long when trying to get the long capacity"); + __annotate_memory_barrier(); + return __rep_.__l.__cap_ * __endian_factor; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __get_long_pointer() _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(__rep_.__l.__is_long_, "String has to be long when trying to get the long pointer"); + __annotate_memory_barrier(); + return __rep_.__l.__data_; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_pointer __get_long_pointer() const _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL(__rep_.__l.__is_long_, "String has to be long when trying to get the long pointer"); + __annotate_memory_barrier(); + return __rep_.__l.__data_; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS pointer + __get_short_pointer() _NOEXCEPT { + __annotate_memory_barrier(); + return pointer_traits<pointer>::pointer_to(__rep_.__s.__data_[0]); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS const_pointer + __get_short_pointer() const _NOEXCEPT { + __annotate_memory_barrier(); + return pointer_traits<const_pointer>::pointer_to(__rep_.__s.__data_[0]); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __get_pointer() _NOEXCEPT { + return __is_long() ? __get_long_pointer() : __get_short_pointer(); + } + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_pointer __get_pointer() const _NOEXCEPT { + return __is_long() ? __get_long_pointer() : __get_short_pointer(); + } + + // Internal buffer management + // -------------------------- + // + // These functions are only responsible for managing the buffer itself, not the value inside the buffer. As such, + // none of these facilities ensure that there is a null terminator at `data()[size()]`. + + // Allocate a buffer of __capacity size with __alloc and return it + _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX20 __long + __allocate_long_buffer(_Allocator& __alloc, size_type __size, size_type __min_capacity) { + _LIBCPP_ASSERT_INTERNAL( + __size <= __min_capacity, "Trying to allocate a long buffer with a smaller capacity than size"); + _LIBCPP_ASSERT_INTERNAL(!__fits_in_sso(__min_capacity), + "Trying to allocate long buffer for a capacity what would fit into the small buffer"); + auto __buffer = std::__allocate_at_least(__alloc, __align_allocation_size(__min_capacity)); + + if (__libcpp_is_constant_evaluated()) { + for (size_type __i = 0; __i != __buffer.count; ++__i) + std::__construct_at(std::addressof(__buffer.ptr[__i])); + } + + return __long(__buffer, __size); + } + + _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX20 __long + __allocate_long_buffer(_Allocator& __alloc, size_type __size) { + return __allocate_long_buffer(__alloc, __size, __size); + } + + // Replace the current buffer with __new_rep. Deallocate the old long buffer if it exists. + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __reset_internal_buffer(__rep __new_rep = __short()) { + __annotate_delete(); + if (__is_long()) + __alloc_traits::deallocate(__alloc_, __get_long_pointer(), __get_long_cap()); + __rep_ = __new_rep; + } + + // Initialize the internal buffer to hold __size elements + // The elements and null terminator have to be set by the caller + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pointer __init_internal_buffer(size_type __size) { + if (__libcpp_is_constant_evaluated()) + __rep_ = __rep(); + + if (__size > max_size()) + __throw_length_error(); + + if (__fits_in_sso(__size)) { + __set_short_size(__size); + __annotate_new(__size); + return __get_short_pointer(); + } else { + __rep_.__l = __allocate_long_buffer(__alloc_, __size); + __annotate_new(__size); + return __get_long_pointer(); + } + } + + // ASan annotation helpers + // ----------------------- + + // The following functions are no-ops outside of AddressSanitizer mode. + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void + __annotate_contiguous_container(const void* __old_mid, const void* __new_mid) const { + (void)__old_mid; + (void)__new_mid; +# if _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING +# if defined(__APPLE__) + // TODO: remove after addressing issue #96099 (https://llvm.org/PR96099) + if (!__is_long()) + return; +# endif + std::__annotate_contiguous_container<_Allocator>(data(), data() + capacity() + 1, __old_mid, __new_mid); +# endif + } + + // Prevents speculative load before short/long state is determined. + // The following functions are no-ops outside of AddressSanitizer mode. + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_memory_barrier() const { +# if _LIBCPP_ENABLE_ASAN_CONTAINER_CHECKS_FOR_STRING + if (__libcpp_is_constant_evaluated()) + return; + asm volatile("" ::: "memory"); +# endif + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_new(size_type __current_size) const _NOEXCEPT { + __annotate_contiguous_container(data() + capacity() + 1, data() + __current_size + 1); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_delete() const _NOEXCEPT { + __annotate_contiguous_container(data() + size() + 1, data() + capacity() + 1); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_increase(size_type __n) const _NOEXCEPT { + __annotate_contiguous_container(data() + size() + 1, data() + size() + 1 + __n); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __annotate_shrink(size_type __old_size) const _NOEXCEPT { + __annotate_contiguous_container(data() + __old_size + 1, data() + size() + 1); + } + + // Disable ASan annotations and enable them again when going out of scope. It is assumed that the string is in a valid + // state at that point, so `size()` can be called safely. + struct [[__nodiscard__]] __annotation_guard { + __annotation_guard(const __annotation_guard&) = delete; + __annotation_guard& operator=(const __annotation_guard&) = delete; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __annotation_guard(basic_string& __str) : __str_(__str) { + __str_.__annotate_delete(); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__annotation_guard() { __str_.__annotate_new(__str_.size()); } + + basic_string& __str_; + }; + + template <size_type __a> + static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type __align_it(size_type __s) _NOEXCEPT { + return (__s + (__a - 1)) & ~(__a - 1); + } + enum { __alignment = 8 }; + + // This makes sure that we're using a capacity with some extra alignment, since allocators almost always over-align + // the allocations anyways, improving memory usage. More importantly, this ensures that the lowest bit is never set + // if __endian_factor == 2, allowing us to store whether we're in the long string inside the lowest bit. + _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + __align_allocation_size(size_type __size) _NOEXCEPT { + _LIBCPP_ASSERT_INTERNAL( + !__fits_in_sso(__size), "Trying to align allocation of a size which would fit into the SSO"); + const size_type __boundary = sizeof(value_type) < __alignment ? __alignment / sizeof(value_type) : __endian_factor; + size_type __guess = __align_it<__boundary>(__size + 1); + if (__guess == __min_cap + 1) + __guess += __endian_factor; + + _LIBCPP_ASSERT_INTERNAL(__guess >= __size, "aligned allocation size is below the requested size"); + return __guess; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 size_type + __get_amortized_growth_capacity(size_type __required_capacity) { + size_type __max_size = max_size(); + if (__required_capacity > __max_size) + __throw_length_error(); + size_type __current_cap = capacity(); + _LIBCPP_ASSERT_INTERNAL( + __current_cap < __required_capacity, "Trying to grow string even though there is enough capacity already?"); + if (__current_cap > __max_size / 2 - __alignment) + return __max_size; + return std::max(__required_capacity, 2 * __current_cap); + } + + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(const value_type* __s, size_type __sz); + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(size_type __n, value_type __c); + + // Slow path for the (inlined) copy constructor for 'long' strings. + // Always externally instantiated and not inlined. + // Requires that __s is zero terminated. + // The main reason for this function to exist is because for unstable, we + // want to allow inlining of the copy constructor. However, we don't want + // to call the __init() functions as those are marked as inline which may + // result in over-aggressive inlining by the compiler, where our aim is + // to only inline the fast path code directly in the ctor. + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void __init_copy_ctor_external(const value_type* __s, size_type __sz); + + template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> = 0> + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_InputIterator __first, _InputIterator __last); + + template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> = 0> + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void __init(_ForwardIterator __first, _ForwardIterator __last); + + template <class _InputIterator, class _Sentinel> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void + __init_with_sentinel(_InputIterator __first, _Sentinel __last); + template <class _InputIterator, class _Sentinel> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void + __init_with_size(_InputIterator __first, _Sentinel __last, size_type __sz); + + _LIBCPP_CONSTEXPR_SINCE_CXX20 +# if _LIBCPP_ABI_VERSION >= 2 // We want to use the function in the dylib in ABIv1 + _LIBCPP_HIDE_FROM_ABI +# endif + _LIBCPP_DEPRECATED_("use __grow_by_without_replace") void __grow_by( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add = 0); + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __grow_by_without_replace( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add = 0); + _LIBCPP_CONSTEXPR_SINCE_CXX20 void __grow_by_and_replace( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add, + const value_type* __p_new_stuff); + + // __assign_no_alias is invoked for assignment operations where we + // have proof that the input does not alias the current instance. + // For example, operator=(basic_string) performs a 'self' check. + template <bool __is_short> + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_no_alias(const value_type* __s, size_type __n); + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __erase_to_end(size_type __pos) { + _LIBCPP_ASSERT_INTERNAL(__pos <= capacity(), "Trying to erase at position outside the strings capacity!"); + __null_terminate_at(__data(), __pos); + } + + // __erase_external_with_move is invoked for erase() invocations where + // `n ~= npos`, likely requiring memory moves on the string data. + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void + __erase_external_with_move(size_type __pos, size_type __n) _NOEXCEPT; + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __copy_assign_alloc(const basic_string& __str) { + __copy_assign_alloc( + __str, integral_constant<bool, __alloc_traits::propagate_on_container_copy_assignment::value>()); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __copy_assign_alloc(const basic_string& __str, true_type) { + if (__alloc_ == __str.__alloc_) + __alloc_ = __str.__alloc_; + else { + if (!__str.__is_long()) { + __reset_internal_buffer(); + __alloc_ = __str.__alloc_; + } else { + __annotate_delete(); + auto __guard = std::__make_scope_guard(__annotate_new_size(*this)); + auto __alloc = __str.__alloc_; + __reset_internal_buffer(__allocate_long_buffer(__alloc, __str.size())); + __alloc_ = std::move(__alloc); + } + } + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void + __copy_assign_alloc(const basic_string&, false_type) _NOEXCEPT {} + +# ifndef _LIBCPP_CXX03_LANG + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void + __move_assign(basic_string& __str, false_type) noexcept(__alloc_traits::is_always_equal::value); + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void + __move_assign(basic_string& __str, true_type) +# if _LIBCPP_STD_VER >= 17 + noexcept; +# else + noexcept(is_nothrow_move_assignable<allocator_type>::value); +# endif +# endif + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string& __str) + _NOEXCEPT_(!__alloc_traits::propagate_on_container_move_assignment::value || + is_nothrow_move_assignable<allocator_type>::value) { + __move_assign_alloc( + __str, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>()); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string& __c, true_type) + _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value) { + __alloc_ = std::move(__c.__alloc_); + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __move_assign_alloc(basic_string&, false_type) _NOEXCEPT {} + + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_external(const value_type* __s); + _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string& __assign_external(const value_type* __s, size_type __n); + + // Assigns the value in __s, guaranteed to be __n < __min_cap in length. + inline _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& __assign_short(const value_type* __s, size_type __n) { + size_type __old_size = size(); + if (__n > __old_size) + __annotate_increase(__n - __old_size); + pointer __p; + if (__is_long()) { + __set_long_size(__n); + __p = __get_long_pointer(); + } else { + __set_short_size(__n); + __p = __get_short_pointer(); + } + traits_type::move(std::__to_address(__p), __s, __n); + traits_type::assign(__p[__n], value_type()); + if (__old_size > __n) + __annotate_shrink(__old_size); + return *this; + } + + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string& + __null_terminate_at(value_type* __p, size_type __newsz) { + size_type __old_size = size(); + if (__newsz > __old_size) + __annotate_increase(__newsz - __old_size); + __set_size(__newsz); + traits_type::assign(__p[__newsz], value_type()); + if (__old_size > __newsz) + __annotate_shrink(__old_size); + return *this; + } + + template <class _Tp> + _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __addr_in_range(const _Tp& __v) const { + return std::__is_pointer_in_range(data(), data() + size() + 1, std::addressof(__v)); + } + + [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI static void __throw_length_error() { + std::__throw_length_error("basic_string"); + } + + [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI static void __throw_out_of_range() { + std::__throw_out_of_range("basic_string"); + } + + friend _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string + __concatenate_strings<>(const _Allocator&, __type_identity_t<__self_view>, __type_identity_t<__self_view>); + + template <class _CharT2, class _Traits2, class _Allocator2> + friend inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool + operator==(const basic_string<_CharT2, _Traits2, _Allocator2>&, const _CharT2*) _NOEXCEPT; + + // These functions aren't used anymore but are part of out ABI, so we need to provide them in the dylib for backwards + // compatibility +# ifdef _LIBCPP_BUILDING_LIBRARY + void __init(const value_type* __s, size_type __sz, size_type __reserve); +# endif +}; + +// These declarations must appear before any functions are implicitly used +// so that they have the correct visibility specifier. +# define _LIBCPP_DECLARE(...) extern template _LIBCPP_EXPORTED_FROM_ABI __VA_ARGS__; +# ifdef _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION +_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, char) +# if _LIBCPP_HAS_WIDE_CHARACTERS +_LIBCPP_STRING_UNSTABLE_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, wchar_t) +# endif +# else +_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, char) +# if _LIBCPP_HAS_WIDE_CHARACTERS +_LIBCPP_STRING_V1_EXTERN_TEMPLATE_LIST(_LIBCPP_DECLARE, wchar_t) +# endif +# endif +# undef _LIBCPP_DECLARE + +# if _LIBCPP_STD_VER <= 17 || !__has_builtin(__builtin_lt_synthesizes_from_spaceship) +template <class _CharT, class _Traits, class _Alloc> +struct __default_three_way_comparator<basic_string<_CharT, _Traits, _Alloc>, basic_string<_CharT, _Traits, _Alloc> > { + using __string_t _LIBCPP_NODEBUG = basic_string<_CharT, _Traits, _Alloc>; + + _LIBCPP_HIDE_FROM_ABI static int operator()(const __string_t& __lhs, const __string_t& __rhs) { + auto __min_len = std::min(__lhs.size(), __rhs.size()); + auto __ret = _Traits::compare(__lhs.data(), __rhs.data(), __min_len); + if (__ret == 0) + return __lhs.size() == __rhs.size() ? 0 : __lhs.size() < __rhs.size() ? -1 : 1; + return __ret; + } +}; +# endif + +template <class _Comparator, class _CharT2, class _CharT, class _Traits, class _Alloc> +inline const bool __is_transparently_comparable_v<_Comparator, basic_string<_CharT, _Traits, _Alloc>, _CharT2*> = + is_same<_CharT, __remove_cv_t<_CharT2> >::value && + (__desugars_to_v<__less_tag, + _Comparator, + basic_string<_CharT, _Traits, _Alloc>, + basic_string<_CharT, _Traits, _Alloc> > || + __desugars_to_v<__greater_tag, + _Comparator, + basic_string<_CharT, _Traits, _Alloc>, + basic_string<_CharT, _Traits, _Alloc> >); + +template <class _Comparator, class _CharT2, class _CharT, class _Traits, class _Alloc> +inline const bool __is_transparently_comparable_v<_Comparator, _CharT2*, basic_string<_CharT, _Traits, _Alloc> > = + __is_transparently_comparable_v<_Comparator, basic_string<_CharT, _Traits, _Alloc>, _CharT2*>; + +template <class _Comparator, class _CharT, class _Traits, class _Alloc, size_t _Np> +inline const bool __is_transparently_comparable_v<_Comparator, basic_string<_CharT, _Traits, _Alloc>, _CharT[_Np]> = + __is_transparently_comparable_v<_Comparator, basic_string<_CharT, _Traits, _Alloc>, const _CharT*>; + +template <class _Comparator, class _CharT, class _Traits, class _Alloc, size_t _Np> +inline const bool __is_transparently_comparable_v<_Comparator, _CharT[_Np], basic_string<_CharT, _Traits, _Alloc> > = + __is_transparently_comparable_v<_Comparator, basic_string<_CharT, _Traits, _Alloc>, const _CharT*>; + +# if _LIBCPP_STD_VER >= 17 +template <class _InputIterator, + class _CharT = __iterator_value_type<_InputIterator>, + class _Allocator = allocator<_CharT>, + class = enable_if_t<__has_input_iterator_category<_InputIterator>::value>, + class = enable_if_t<__is_allocator_v<_Allocator>>> +basic_string(_InputIterator, _InputIterator, _Allocator = _Allocator()) + -> basic_string<_CharT, char_traits<_CharT>, _Allocator>; + +template <class _CharT, + class _Traits, + class _Allocator = allocator<_CharT>, + class = enable_if_t<__is_allocator_v<_Allocator>>> +explicit basic_string(basic_string_view<_CharT, _Traits>, const _Allocator& = _Allocator()) + -> basic_string<_CharT, _Traits, _Allocator>; + +template <class _CharT, + class _Traits, + class _Allocator = allocator<_CharT>, + class = enable_if_t<__is_allocator_v<_Allocator>>, + class _Sz = typename allocator_traits<_Allocator>::size_type > +basic_string(basic_string_view<_CharT, _Traits>, _Sz, _Sz, const _Allocator& = _Allocator()) + -> basic_string<_CharT, _Traits, _Allocator>; +# endif + +# if _LIBCPP_STD_VER >= 23 +template <ranges::input_range _Range, + class _Allocator = allocator<ranges::range_value_t<_Range>>, + class = enable_if_t<__is_allocator_v<_Allocator>>> +basic_string(from_range_t, _Range&&, _Allocator = _Allocator()) + -> basic_string<ranges::range_value_t<_Range>, char_traits<ranges::range_value_t<_Range>>, _Allocator>; +# endif + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz) { + pointer __p = __init_internal_buffer(__sz); + traits_type::copy(std::__to_address(__p), __s, __sz); + traits_type::assign(__p[__sz], value_type()); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void +basic_string<_CharT, _Traits, _Allocator>::__init_copy_ctor_external(const value_type* __s, size_type __sz) { + pointer __p = __init_internal_buffer(__sz); + traits_type::copy(std::__to_address(__p), __s, __sz + 1); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c) { + pointer __p = __init_internal_buffer(__n); + traits_type::assign(std::__to_address(__p), __n, __c); + traits_type::assign(__p[__n], value_type()); +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _InputIterator, __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value, int> > +_LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last) { + __init_with_sentinel(std::move(__first), std::move(__last)); +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _InputIterator, class _Sentinel> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__init_with_sentinel(_InputIterator __first, _Sentinel __last) { + __rep_ = __rep(); + __annotate_new(0); + + auto __guard = std::__make_exception_guard([this] { __reset_internal_buffer(); }); + for (; __first != __last; ++__first) + push_back(*__first); + __guard.__complete(); +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _ForwardIterator, __enable_if_t<__has_forward_iterator_category<_ForwardIterator>::value, int> > +_LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last) { + size_type __sz = static_cast<size_type>(std::distance(__first, __last)); + __init_with_size(__first, __last, __sz); +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _InputIterator, class _Sentinel> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__init_with_size(_InputIterator __first, _Sentinel __last, size_type __sz) { + pointer __p = __init_internal_buffer(__sz); + + auto __guard = std::__make_exception_guard([this] { __reset_internal_buffer(); }); + auto __end = __copy_non_overlapping_range(std::move(__first), std::move(__last), std::__to_address(__p)); + traits_type::assign(*__end, value_type()); + __guard.__complete(); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add, + const value_type* __p_new_stuff) { + __long __buffer = __allocate_long_buffer(__alloc_, 0, __get_amortized_growth_capacity(__old_cap + __delta_cap)); + value_type* __old_p = __data(); + __annotate_delete(); + auto __guard = std::__make_scope_guard(__annotate_new_size(*this)); + if (__n_copy != 0) + traits_type::copy(std::__to_address(__buffer.__data_), __old_p, __n_copy); + if (__n_add != 0) + traits_type::copy(std::__to_address(__buffer.__data_) + __n_copy, __p_new_stuff, __n_add); + size_type __sec_cp_sz = __old_sz - __n_del - __n_copy; + if (__sec_cp_sz != 0) + traits_type::copy( + std::__to_address(__buffer.__data_) + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz); + __buffer.__size_ = __n_copy + __n_add + __sec_cp_sz; + traits_type::assign(__buffer.__data_[__buffer.__size_], value_type()); + __reset_internal_buffer(__buffer); +} + +// __grow_by is deprecated because it does not set the size. It may not update the size when the size is changed, and it +// may also not set the size at all when the string was short initially. This leads to unpredictable size value. It is +// not removed or changed to avoid breaking the ABI. +template <class _CharT, class _Traits, class _Allocator> +void _LIBCPP_CONSTEXPR_SINCE_CXX20 +# if _LIBCPP_ABI_VERSION >= 2 // We want to use the function in the dylib in ABIv1 +_LIBCPP_HIDE_FROM_ABI +# endif +_LIBCPP_DEPRECATED_("use __grow_by_without_replace") basic_string<_CharT, _Traits, _Allocator>::__grow_by( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add) { + __long __buffer = __allocate_long_buffer(__alloc_, 0, __get_amortized_growth_capacity(__old_cap + __delta_cap)); + value_type* __old_p = __data(); + if (__n_copy != 0) + traits_type::copy(std::__to_address(__buffer.__data_), __old_p, __n_copy); + size_type __sec_cp_sz = __old_sz - __n_del - __n_copy; + if (__sec_cp_sz != 0) + traits_type::copy( + std::__to_address(__buffer.__data_) + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz); + // This is -1 to make sure the caller sets the size properly, since old versions of this function didn't set the size + // at all. + __buffer.__size_ = -1; + __reset_internal_buffer(__buffer); +} + +template <class _CharT, class _Traits, class _Allocator> +void _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI +basic_string<_CharT, _Traits, _Allocator>::__grow_by_without_replace( + size_type __old_cap, + size_type __delta_cap, + size_type __old_sz, + size_type __n_copy, + size_type __n_del, + size_type __n_add) { + __annotate_delete(); + auto __guard = std::__make_scope_guard(__annotate_new_size(*this)); + _LIBCPP_SUPPRESS_DEPRECATED_PUSH + __grow_by(__old_cap, __delta_cap, __old_sz, __n_copy, __n_del, __n_add); + _LIBCPP_SUPPRESS_DEPRECATED_POP + // Due to the ABI of __grow_by we have to set the size after calling it. + __set_long_size(__old_sz - __n_del + __n_add); +} + +// assign + +template <class _CharT, class _Traits, class _Allocator> +template <bool __is_short> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::__assign_no_alias(const value_type* __s, size_type __n) { + const auto __cap = __is_short ? static_cast<size_type>(__min_cap) : __get_long_cap(); + const auto __size = __is_short ? __get_short_size() : __get_long_size(); + if (__n >= __cap) { + __grow_by_and_replace(__cap - 1, __n - __cap + 1, __size, 0, __size, __n, __s); + return *this; + } + + __annotate_delete(); + auto __guard = std::__make_scope_guard(__annotate_new_size(*this)); + pointer __p; + if (__is_short) { + __p = __get_short_pointer(); + __set_short_size(__n); + } else { + __p = __get_long_pointer(); + __set_long_size(__n); + } + traits_type::copy(std::__to_address(__p), __s, __n); + traits_type::assign(__p[__n], value_type()); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::__assign_external(const value_type* __s, size_type __n) { + const auto __cap = capacity(); + const auto __size = size(); + if (__cap >= __n) { + if (__n > __size) + __annotate_increase(__n - __size); + value_type* __p = __data(); + traits_type::move(__p, __s, __n); + return __null_terminate_at(__p, __n); + } else { + __grow_by_and_replace(__cap, __n - __cap, __size, 0, __size, __n, __s); + return *this; + } +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n) { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::assign received nullptr"); + return (__builtin_constant_p(__n) && __fits_in_sso(__n)) ? __assign_short(__s, __n) : __assign_external(__s, __n); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::assign(size_type __n, value_type __c) { + size_type __cap = capacity(); + size_type __old_size = size(); + if (__cap < __n) { + __grow_by_without_replace(__cap, __n - __cap, __old_size, 0, __old_size); + __annotate_increase(__n); + } else if (__n > __old_size) + __annotate_increase(__n - __old_size); + value_type* __p = __data(); + traits_type::assign(__p, __n, __c); + return __null_terminate_at(__p, __n); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::operator=(value_type __c) { + size_type __old_size = size(); + if (__old_size == 0) + __annotate_increase(1); + pointer __p; + if (__is_long()) { + __p = __get_long_pointer(); + __set_long_size(1); + } else { + __p = __get_short_pointer(); + __set_short_size(1); + } + traits_type::assign(*__p, __c); + traits_type::assign(*++__p, value_type()); + if (__old_size > 1) + __annotate_shrink(__old_size); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str) { + if (this == std::addressof(__str)) + return *this; + + __copy_assign_alloc(__str); + + if (__is_long()) + return __assign_no_alias<false>(__str.data(), __str.size()); + + if (__str.__is_long()) + return __assign_no_alias<true>(__str.data(), __str.size()); + + __annotate_delete(); + auto __guard = std::__make_scope_guard(__annotate_new_size(*this)); + __rep_ = __str.__rep_; + + return *this; +} + +# ifndef _LIBCPP_CXX03_LANG + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::__move_assign( + basic_string& __str, false_type) noexcept(__alloc_traits::is_always_equal::value) { + if (__alloc_ != __str.__alloc_) + assign(__str); + else + __move_assign(__str, true_type()); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS void +basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type) +# if _LIBCPP_STD_VER >= 17 + noexcept +# else + noexcept(is_nothrow_move_assignable<allocator_type>::value) +# endif +{ + __annotate_delete(); + if (__is_long()) { + __reset_internal_buffer(); +# if _LIBCPP_STD_VER <= 14 + if (!is_nothrow_move_assignable<allocator_type>::value) { + __set_short_size(0); + traits_type::assign(__get_short_pointer()[0], value_type()); + __annotate_new(0); + } +# endif + } + size_type __str_old_size = __str.size(); + bool __str_was_short = !__str.__is_long(); + + __move_assign_alloc(__str); + __rep_ = __str.__rep_; + __str.__set_short_size(0); + traits_type::assign(__str.__get_short_pointer()[0], value_type()); + + if (__str_was_short && this != std::addressof(__str)) + __str.__annotate_shrink(__str_old_size); + else + // ASan annotations: was long, so object memory is unpoisoned as new. + // Or is same as *this, and __annotate_delete() was called. + __str.__annotate_new(0); + + // ASan annotations: Guard against `std::string s; s = std::move(s);` + // You can find more here: https://en.cppreference.com/w/cpp/utility/move + // Quote: "Unless otherwise specified, all standard library objects that have been moved + // from are placed in a "valid but unspecified state", meaning the object's class + // invariants hold (so functions without preconditions, such as the assignment operator, + // can be safely used on the object after it was moved from):" + // Quote: "v = std::move(v); // the value of v is unspecified" + if (!__is_long() && std::addressof(__str) != this) + // If it is long string, delete was never called on original __str's buffer. + __annotate_new(__get_short_size()); +} + +# endif + +template <class _CharT, class _Traits, class _Allocator> +template <class _InputIterator, class _Sentinel> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void +basic_string<_CharT, _Traits, _Allocator>::__assign_with_sentinel(_InputIterator __first, _Sentinel __last) { + const basic_string __temp(__init_with_sentinel_tag(), std::move(__first), std::move(__last), __alloc_); + assign(__temp.data(), __temp.size()); +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _Iterator, class _Sentinel> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void +basic_string<_CharT, _Traits, _Allocator>::__assign_trivial(_Iterator __first, _Sentinel __last, size_type __n) { + _LIBCPP_ASSERT_INTERNAL( + __string_is_trivial_iterator_v<_Iterator>, "The iterator type given to `__assign_trivial` must be trivial"); + + size_type __old_size = size(); + size_type __cap = capacity(); + if (__cap < __n) { + // Unlike `append` functions, if the input range points into the string itself, there is no case that the input + // range could get invalidated by reallocation: + // 1. If the input range is a subset of the string itself, its size cannot exceed the capacity of the string, + // thus no reallocation would happen. + // 2. In the exotic case where the input range is the byte representation of the string itself, the string + // object itself stays valid even if reallocation happens. + size_type __sz = size(); + __grow_by_without_replace(__cap, __n - __cap, __sz, 0, __sz); + __annotate_increase(__n); + } else if (__n > __old_size) + __annotate_increase(__n - __old_size); + pointer __p = __get_pointer(); + for (; __first != __last; ++__p, (void)++__first) + traits_type::assign(*__p, *__first); + traits_type::assign(*__p, value_type()); + __set_size(__n); + if (__n < __old_size) + __annotate_shrink(__old_size); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, size_type __pos, size_type __n) { + size_type __sz = __str.size(); + if (__pos > __sz) + this->__throw_out_of_range(); + return assign(__str.data() + __pos, std::min(__n, __sz - __pos)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::__assign_external(const value_type* __s) { + return __assign_external(__s, traits_type::length(__s)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::assign received nullptr"); + if (auto __len = traits_type::length(__s); __builtin_constant_p(__len) && __fits_in_sso(__len)) + return __assign_short(__s, __len); + return __assign_external(__s); +} +// append + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s, size_type __n) { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::append received nullptr"); + size_type __cap = capacity(); + size_type __sz = size(); + if (__cap - __sz < __n) { + __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __sz, 0, __n, __s); + return *this; + } + + if (__n == 0) + return *this; + + __annotate_increase(__n); + value_type* __p = __data(); + traits_type::copy(__p + __sz, __s, __n); + __sz += __n; + __set_size(__sz); + traits_type::assign(__p[__sz], value_type()); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::append(size_type __n, value_type __c) { + if (__n == 0) + return *this; + + size_type __cap = capacity(); + size_type __sz = size(); + if (__cap - __sz < __n) + __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __sz, 0); + __annotate_increase(__n); + value_type* __p = __data(); + traits_type::assign(std::__to_address(__p) + __sz, __n, __c); + __sz += __n; + __set_size(__sz); + traits_type::assign(__p[__sz], value_type()); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::push_back(value_type __c) { + bool __is_short = !__is_long(); + size_type __cap; + size_type __sz; + if (__is_short) { + __cap = __min_cap - 1; + __sz = __get_short_size(); + } else { + __cap = __get_long_cap() - 1; + __sz = __get_long_size(); + } + if (__sz == __cap) { + __grow_by_without_replace(__cap, 1, __sz, __sz, 0); + __is_short = false; // the string is always long after __grow_by + } + __annotate_increase(1); + pointer __p; + if (__is_short) { + __p = __get_short_pointer() + __sz; + __set_short_size(__sz + 1); + } else { + __p = __get_long_pointer() + __sz; + __set_long_size(__sz + 1); + } + traits_type::assign(*__p, __c); + traits_type::assign(*++__p, value_type()); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, size_type __pos, size_type __n) { + size_type __sz = __str.size(); + if (__pos > __sz) + this->__throw_out_of_range(); + return append(__str.data() + __pos, std::min(__n, __sz - __pos)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::append received nullptr"); + return append(__s, traits_type::length(__s)); +} + +// insert + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s, size_type __n) { + _LIBCPP_ASSERT_NON_NULL(__n == 0 || __s != nullptr, "string::insert received nullptr"); + size_type __sz = size(); + if (__pos > __sz) + this->__throw_out_of_range(); + size_type __cap = capacity(); + + if (__cap - __sz < __n) { + __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n, __s); + return *this; + } + + if (__n == 0) + return *this; + + __annotate_increase(__n); + value_type* __p = __data(); + size_type __n_move = __sz - __pos; + if (__n_move != 0) { + if (std::__is_pointer_in_range(__p + __pos, __p + __sz, __s)) + __s += __n; + traits_type::move(__p + __pos + __n, __p + __pos, __n_move); + } + traits_type::move(__p + __pos, __s, __n); + __sz += __n; + __set_size(__sz); + traits_type::assign(__p[__sz], value_type()); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n, value_type __c) { + size_type __sz = size(); + if (__pos > __sz) + this->__throw_out_of_range(); + + if (__n == 0) + return *this; + + size_type __cap = capacity(); + value_type* __p; + if (__cap - __sz >= __n) { + __annotate_increase(__n); + __p = __data(); + size_type __n_move = __sz - __pos; + if (__n_move != 0) + traits_type::move(__p + __pos + __n, __p + __pos, __n_move); + } else { + __grow_by_without_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n); + __p = std::__to_address(__get_long_pointer()); + } + traits_type::assign(__p + __pos, __n, __c); + __sz += __n; + __set_size(__sz); + traits_type::assign(__p[__sz], value_type()); + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +template <class _Iterator, class _Sentinel> +_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator +basic_string<_CharT, _Traits, _Allocator>::__insert_with_size( + const_iterator __pos, _Iterator __first, _Sentinel __last, size_type __n) { + size_type __ip = static_cast<size_type>(__pos - begin()); + if (__n == 0) + return begin() + __ip; + + if (__string_is_trivial_iterator_v<_Iterator> && !__addr_in_range(*__first)) { + return __insert_from_safe_copy(__n, __ip, std::move(__first), std::move(__last)); + } else { + const basic_string __temp(__init_with_sentinel_tag(), std::move(__first), std::move(__last), __alloc_); + return __insert_from_safe_copy(__n, __ip, __temp.begin(), __temp.end()); + } +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::insert( + size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n) { + size_type __str_sz = __str.size(); + if (__pos2 > __str_sz) + this->__throw_out_of_range(); + return insert(__pos1, __str.data() + __pos2, std::min(__n, __str_sz - __pos2)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::insert received nullptr"); + return insert(__pos, __s, traits_type::length(__s)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator +basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, value_type __c) { + size_type __ip = static_cast<size_type>(__pos - begin()); + size_type __sz = size(); + size_type __cap = capacity(); + value_type* __p; + if (__cap == __sz) { + __grow_by_without_replace(__cap, 1, __sz, __ip, 0, 1); + __p = std::__to_address(__get_long_pointer()); + } else { + __annotate_increase(1); + __p = __data(); + size_type __n_move = __sz - __ip; + if (__n_move != 0) + traits_type::move(__p + __ip + 1, __p + __ip, __n_move); + } + traits_type::assign(__p[__ip], __c); + traits_type::assign(__p[++__sz], value_type()); + __set_size(__sz); + return begin() + static_cast<difference_type>(__ip); +} + +// replace + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::replace( + size_type __pos, size_type __n1, const value_type* __s, size_type __n2) + _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK { + _LIBCPP_ASSERT_NON_NULL(__n2 == 0 || __s != nullptr, "string::replace received nullptr"); + size_type __sz = size(); + if (__pos > __sz) + this->__throw_out_of_range(); + __n1 = std::min(__n1, __sz - __pos); + size_type __cap = capacity(); + if (__cap - __sz + __n1 < __n2) { + __grow_by_and_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2, __s); + return *this; + } + + value_type* __p = __data(); + if (__n1 != __n2) { + if (__n2 > __n1) + __annotate_increase(__n2 - __n1); + size_type __n_move = __sz - __pos - __n1; + if (__n_move != 0) { + if (__n1 > __n2) { + traits_type::move(__p + __pos, __s, __n2); + traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move); + return __null_terminate_at(__p, __sz + (__n2 - __n1)); + } + if (std::__is_pointer_in_range(__p + __pos + 1, __p + __sz, __s)) { + if (__p + __pos + __n1 <= __s) { + __s += __n2 - __n1; + } else { // __p + __pos < __s < __p + __pos + __n1 + traits_type::move(__p + __pos, __s, __n1); + __pos += __n1; + __s += __n2; + __n2 -= __n1; + __n1 = 0; + } + } + traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move); + } + } + traits_type::move(__p + __pos, __s, __n2); + return __null_terminate_at(__p, __sz + (__n2 - __n1)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, size_type __n2, value_type __c) { + size_type __sz = size(); + if (__pos > __sz) + this->__throw_out_of_range(); + __n1 = std::min(__n1, __sz - __pos); + size_type __cap = capacity(); + value_type* __p; + if (__cap - __sz + __n1 >= __n2) { + __p = __data(); + if (__n1 != __n2) { + if (__n2 > __n1) + __annotate_increase(__n2 - __n1); + size_type __n_move = __sz - __pos - __n1; + if (__n_move != 0) + traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move); + } + } else { + __grow_by_without_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2); + __p = std::__to_address(__get_long_pointer()); + } + traits_type::assign(__p + __pos, __n2, __c); + return __null_terminate_at(__p, __sz - (__n1 - __n2)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::replace( + size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) { + size_type __str_sz = __str.size(); + if (__pos2 > __str_sz) + this->__throw_out_of_range(); + return replace(__pos1, __n1, __str.data() + __pos2, std::min(__n2, __str_sz - __pos2)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s) { + _LIBCPP_ASSERT_NON_NULL(__s != nullptr, "string::replace received nullptr"); + return replace(__pos, __n1, __s, traits_type::length(__s)); +} + +// erase + +// 'externally instantiated' erase() implementation, called when __n != npos. +// Does not check __pos against size() +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_NOINLINE void +basic_string<_CharT, _Traits, _Allocator>::__erase_external_with_move(size_type __pos, size_type __n) _NOEXCEPT { + if (__n == 0) + return; + + size_type __sz = size(); + value_type* __p = __data(); + __n = std::min(__n, __sz - __pos); + size_type __n_move = __sz - __pos - __n; + if (__n_move != 0) + traits_type::move(__p + __pos, __p + __pos + __n, __n_move); + __null_terminate_at(__p, __sz - __n); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator>& +basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n) { + if (__pos > size()) + this->__throw_out_of_range(); + if (__n == npos) { + __erase_to_end(__pos); + } else { + __erase_external_with_move(__pos, __n); + } + return *this; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator +basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __pos) { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS( + __pos != end(), "string::erase(iterator) called with a non-dereferenceable iterator"); + iterator __b = begin(); + size_type __r = static_cast<size_type>(__pos - __b); + erase(__r, 1); + return __b + static_cast<difference_type>(__r); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::iterator +basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __first, const_iterator __last) { + _LIBCPP_ASSERT_VALID_INPUT_RANGE(__first <= __last, "string::erase(first, last) called with invalid range"); + iterator __b = begin(); + size_type __r = static_cast<size_type>(__first - __b); + erase(__r, static_cast<size_type>(__last - __first)); + return __b + static_cast<difference_type>(__r); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::pop_back() { + _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "string::pop_back(): string is already empty"); + __erase_to_end(size() - 1); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::clear() _NOEXCEPT { + size_type __old_size; + if (__is_long()) { + __old_size = __get_long_size(); + traits_type::assign(*__get_long_pointer(), value_type()); + __set_long_size(0); + } else { + __old_size = __get_short_size(); + traits_type::assign(*__get_short_pointer(), value_type()); + __set_short_size(0); + } + __annotate_shrink(__old_size); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::resize(size_type __n, value_type __c) { + size_type __sz = size(); + if (__n > __sz) + append(__n - __sz, __c); + else + __erase_to_end(__n); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::reserve(size_type __requested_capacity) { + if (__requested_capacity > max_size()) + this->__throw_length_error(); + + // Make sure reserve(n) never shrinks. This is technically only required in C++20 + // and later (since P0966R1), however we provide consistent behavior in all Standard + // modes because this function is instantiated in the shared library. + if (__requested_capacity <= capacity()) + return; + + __annotation_guard __g(*this); + __long __buffer = __allocate_long_buffer(__alloc_, size(), __requested_capacity); + traits_type::copy(std::__to_address(__buffer.__data_), data(), __buffer.__size_ + 1); + __reset_internal_buffer(__buffer); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::shrink_to_fit() _NOEXCEPT { + if (!__is_long()) + return; + + const auto __ptr = __get_long_pointer(); + const auto __size = __get_long_size(); + const auto __cap = __get_long_cap(); + + // We're a long string and we're shrinking into the small buffer. + if (__fits_in_sso(__size)) { + __annotation_guard __g(*this); + __set_short_size(__size); + traits_type::copy(std::__to_address(__get_short_pointer()), std::__to_address(__ptr), __size + 1); + __alloc_traits::deallocate(__alloc_, __ptr, __cap); + return; + } + + if (__align_allocation_size(__size) == __cap) + return; + +# if _LIBCPP_HAS_EXCEPTIONS + try { +# endif // _LIBCPP_HAS_EXCEPTIONS + __annotation_guard __g(*this); + __long __buffer = __allocate_long_buffer(__alloc_, __size); + + // The Standard mandates shrink_to_fit() does not increase the capacity. + // With equal capacity keep the existing buffer. This avoids extra work + // due to swapping the elements. + if (__buffer.__cap_ * __endian_factor - 1 >= capacity()) { + __alloc_traits::deallocate(__alloc_, __buffer.__data_, __buffer.__cap_ * __endian_factor); + return; + } + + traits_type::copy(std::__to_address(__buffer.__data_), std::__to_address(__get_long_pointer()), __size + 1); + __reset_internal_buffer(__buffer); +# if _LIBCPP_HAS_EXCEPTIONS + } catch (...) { + return; + } +# endif // _LIBCPP_HAS_EXCEPTIONS +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::const_reference +basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) const { + if (__n >= size()) + this->__throw_out_of_range(); + return (*this)[__n]; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::reference +basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) { + if (__n >= size()) + this->__throw_out_of_range(); + return (*this)[__n]; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_CONSTEXPR_SINCE_CXX20 typename basic_string<_CharT, _Traits, _Allocator>::size_type +basic_string<_CharT, _Traits, _Allocator>::copy(value_type* __s, size_type __n, size_type __pos) const { + size_type __sz = size(); + if (__pos > __sz) + this->__throw_out_of_range(); + size_type __rlen = std::min(__n, __sz - __pos); + traits_type::copy(__s, data() + __pos, __rlen); + return __rlen; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 void basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str) +# if _LIBCPP_STD_VER >= 14 + _NOEXCEPT +# else + _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value || __is_nothrow_swappable_v<allocator_type>) +# endif +{ + _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( + __alloc_traits::propagate_on_container_swap::value || __alloc_traits::is_always_equal::value || + __alloc_ == __str.__alloc_, + "swapping non-equal allocators"); + if (!__is_long()) + __annotate_delete(); + if (this != std::addressof(__str) && !__str.__is_long()) + __str.__annotate_delete(); + std::swap(__rep_, __str.__rep_); + std::__swap_allocator(__alloc_, __str.__alloc_); + if (!__is_long()) + __annotate_new(__get_short_size()); + if (this != std::addressof(__str) && !__str.__is_long()) + __str.__annotate_new(__str.__get_short_size()); +} + +// compare + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 int basic_string<_CharT, _Traits, _Allocator>::compare( + size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const { + _LIBCPP_ASSERT_NON_NULL(__n2 == 0 || __s != nullptr, "string::compare(): received nullptr"); + size_type __sz = size(); + if (__pos1 > __sz || __n2 == npos) + this->__throw_out_of_range(); + size_type __rlen = std::min(__n1, __sz - __pos1); + int __r = traits_type::compare(data() + __pos1, __s, std::min(__rlen, __n2)); + if (__r == 0) { + if (__rlen < __n2) + __r = -1; + else if (__rlen > __n2) + __r = 1; + } + return __r; +} + +// __invariants + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 bool basic_string<_CharT, _Traits, _Allocator>::__invariants() const { + if (size() > capacity()) + return false; + if (capacity() < __min_cap - 1) + return false; + if (data() == nullptr) + return false; + if (!_Traits::eq(data()[size()], value_type())) + return false; + return true; +} + +// operator== + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool +operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + size_t __lhs_sz = __lhs.size(); + return __lhs_sz == __rhs.size() && _Traits::compare(__lhs.data(), __rhs.data(), __lhs_sz) == 0; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI bool +operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const _CharT* _LIBCPP_DIAGNOSE_NULLPTR __rhs) _NOEXCEPT { + _LIBCPP_ASSERT_NON_NULL(__rhs != nullptr, "operator==(basic_string, char*): received nullptr"); + + using _String = basic_string<_CharT, _Traits, _Allocator>; + + size_t __rhs_len = _Traits::length(__rhs); + if (__builtin_constant_p(__rhs_len) && !_String::__fits_in_sso(__rhs_len)) { + if (!__lhs.__is_long()) + return false; + } + if (__rhs_len != __lhs.size()) + return false; + return __lhs.compare(0, _String::npos, __rhs, __rhs_len) == 0; +} + +# if _LIBCPP_STD_VER <= 17 +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator==(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return __rhs == __lhs; +} +# endif // _LIBCPP_STD_VER <= 17 + +# if _LIBCPP_STD_VER >= 20 + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) noexcept { + return basic_string_view<_CharT, _Traits>(__lhs) <=> basic_string_view<_CharT, _Traits>(__rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr auto +operator<=>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) { + return basic_string_view<_CharT, _Traits>(__lhs) <=> basic_string_view<_CharT, _Traits>(__rhs); +} + +# else // _LIBCPP_STD_VER >= 20 + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__lhs == __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator!=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__lhs == __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT { + return !(__lhs == __rhs); +} + +// operator< + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool operator<(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return __lhs.compare(__rhs) < 0; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator<(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT { + return __lhs.compare(__rhs) < 0; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator<(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return __rhs.compare(__lhs) > 0; +} + +// operator> + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool operator>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return __rhs < __lhs; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator>(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT { + return __rhs < __lhs; +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator>(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return __rhs < __lhs; +} + +// operator<= + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__rhs < __lhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT { + return !(__rhs < __lhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator<=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__rhs < __lhs); +} + +// operator>= + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__lhs < __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) _NOEXCEPT { + return !(__lhs < __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI bool +operator>=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT { + return !(__lhs < __rhs); +} +# endif // _LIBCPP_STD_VER >= 20 + +// operator + + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +__concatenate_strings(const _Allocator& __alloc, + __type_identity_t<basic_string_view<_CharT, _Traits> > __str1, + __type_identity_t<basic_string_view<_CharT, _Traits> > __str2) { + using _String = basic_string<_CharT, _Traits, _Allocator>; + _String __r(__uninitialized_size_tag(), + __str1.size() + __str2.size(), + _String::__alloc_traits::select_on_container_copy_construction(__alloc)); + auto __ptr = __r.__data(); + _Traits::copy(__ptr, __str1.data(), __str1.size()); + _Traits::copy(__ptr + __str1.size(), __str2.data(), __str2.size()); + _Traits::assign(__ptr[__str1.size() + __str2.size()], _CharT()); + return __r; +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) { + return std::__concatenate_strings<_CharT, _Traits>(__lhs.get_allocator(), __lhs, __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDDEN _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) { + return std::__concatenate_strings<_CharT, _Traits>(__rhs.get_allocator(), __lhs, __rhs); +} + +extern template _LIBCPP_EXPORTED_FROM_ABI string operator+ + <char, char_traits<char>, allocator<char> >(char const*, string const&); + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) { + return std::__concatenate_strings<_CharT, _Traits>( + __rhs.get_allocator(), basic_string_view<_CharT, _Traits>(std::addressof(__lhs), 1), __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs) { + return std::__concatenate_strings<_CharT, _Traits>(__lhs.get_allocator(), __lhs, __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, _CharT __rhs) { + return std::__concatenate_strings<_CharT, _Traits>( + __lhs.get_allocator(), __lhs, basic_string_view<_CharT, _Traits>(std::addressof(__rhs), 1)); +} +# if _LIBCPP_STD_VER >= 26 + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator> +operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, + type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) { + return std::__concatenate_strings<_CharT, _Traits>(__lhs.get_allocator(), __lhs, __rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator> +operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs, + const basic_string<_CharT, _Traits, _Allocator>& __rhs) { + return std::__concatenate_strings<_CharT, _Traits>(__rhs.get_allocator(), __lhs, __rhs); +} + +# endif // _LIBCPP_STD_VER >= 26 + +# ifndef _LIBCPP_CXX03_LANG + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs) { + return std::move(__lhs.append(__rhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) { + return std::move(__rhs.insert(0, __lhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) { + return std::move(__lhs.append(__rhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(const _CharT* __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) { + return std::move(__rhs.insert(0, __lhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(_CharT __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs) { + __rhs.insert(__rhs.begin(), __lhs); + return std::move(__rhs); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const _CharT* __rhs) { + return std::move(__lhs.append(__rhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<_CharT, _Traits, _Allocator> +operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, _CharT __rhs) { + __lhs.push_back(__rhs); + return std::move(__lhs); +} + +# endif // _LIBCPP_CXX03_LANG + +# if _LIBCPP_STD_VER >= 26 + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator> +operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, + type_identity_t<basic_string_view<_CharT, _Traits>> __rhs) { + return std::move(__lhs.append(__rhs)); +} + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI constexpr basic_string<_CharT, _Traits, _Allocator> +operator+(type_identity_t<basic_string_view<_CharT, _Traits>> __lhs, + basic_string<_CharT, _Traits, _Allocator>&& __rhs) { + return std::move(__rhs.insert(0, __lhs)); +} + +# endif // _LIBCPP_STD_VER >= 26 + +// swap + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void +swap(basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>& __rhs) + _NOEXCEPT_(_NOEXCEPT_(__lhs.swap(__rhs))) { + __lhs.swap(__rhs); +} + +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI int stoi(const string& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI unsigned long +stoul(const string& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long stol(const string& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long long +stoll(const string& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI unsigned long long +stoull(const string& __str, size_t* __idx = nullptr, int __base = 10); + +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI float stof(const string& __str, size_t* __idx = nullptr); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI double stod(const string& __str, size_t* __idx = nullptr); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long double stold(const string& __str, size_t* __idx = nullptr); + +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(int __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(long long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(unsigned long long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(float __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(double __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI string to_string(long double __val); + +# if _LIBCPP_HAS_WIDE_CHARACTERS +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI int stoi(const wstring& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long stol(const wstring& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI unsigned long +stoul(const wstring& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long long +stoll(const wstring& __str, size_t* __idx = nullptr, int __base = 10); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI unsigned long long +stoull(const wstring& __str, size_t* __idx = nullptr, int __base = 10); + +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI float stof(const wstring& __str, size_t* __idx = nullptr); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI double stod(const wstring& __str, size_t* __idx = nullptr); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long double stold(const wstring& __str, size_t* __idx = nullptr); + +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(int __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long long __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(float __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(double __val); +[[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long double __val); +# endif // _LIBCPP_HAS_WIDE_CHARACTERS + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_TEMPLATE_DATA_VIS const typename basic_string<_CharT, _Traits, _Allocator>::size_type + basic_string<_CharT, _Traits, _Allocator>::npos; + +template <class _CharT, class _Allocator> +struct __string_hash : public __unary_function<basic_string<_CharT, char_traits<_CharT>, _Allocator>, size_t> { + [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI size_t + operator()(const basic_string<_CharT, char_traits<_CharT>, _Allocator>& __val) const _NOEXCEPT { + return std::__do_string_hash(__val.data(), __val.data() + __val.size()); + } +}; + +template <class _Allocator> +struct hash<basic_string<char, char_traits<char>, _Allocator> > : __string_hash<char, _Allocator> {}; + +# if _LIBCPP_HAS_CHAR8_T +template <class _Allocator> +struct hash<basic_string<char8_t, char_traits<char8_t>, _Allocator> > : __string_hash<char8_t, _Allocator> {}; +# endif + +template <class _Allocator> +struct hash<basic_string<char16_t, char_traits<char16_t>, _Allocator> > : __string_hash<char16_t, _Allocator> {}; + +template <class _Allocator> +struct hash<basic_string<char32_t, char_traits<char32_t>, _Allocator> > : __string_hash<char32_t, _Allocator> {}; + +# if _LIBCPP_HAS_WIDE_CHARACTERS +template <class _Allocator> +struct hash<basic_string<wchar_t, char_traits<wchar_t>, _Allocator> > : __string_hash<wchar_t, _Allocator> {}; +# endif + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& +operator<<(basic_ostream<_CharT, _Traits>& __os, const basic_string<_CharT, _Traits, _Allocator>& __str); + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& +operator>>(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str); + +template <class _CharT, class _Traits, class _Allocator> +_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& +getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm); + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& +getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str); + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& +getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm); + +template <class _CharT, class _Traits, class _Allocator> +inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& +getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str); + +# if _LIBCPP_STD_VER >= 20 +template <class _CharT, class _Traits, class _Allocator, class _Up> +inline _LIBCPP_HIDE_FROM_ABI constexpr typename basic_string<_CharT, _Traits, _Allocator>::size_type +erase(basic_string<_CharT, _Traits, _Allocator>& __str, const _Up& __v) { + auto __old_size = __str.size(); + __str.erase(std::remove(__str.begin(), __str.end(), __v), __str.end()); + return __old_size - __str.size(); +} + +template <class _CharT, class _Traits, class _Allocator, class _Predicate> +inline _LIBCPP_HIDE_FROM_ABI constexpr typename basic_string<_CharT, _Traits, _Allocator>::size_type +erase_if(basic_string<_CharT, _Traits, _Allocator>& __str, _Predicate __pred) { + auto __old_size = __str.size(); + __str.erase(std::remove_if(__str.begin(), __str.end(), __pred), __str.end()); + return __old_size - __str.size(); +} +# endif + +# if _LIBCPP_STD_VER >= 14 +// Literal suffixes for basic_string [basic.string.literals] +inline namespace literals { +inline namespace string_literals { +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char> +operator""s(const char* __str, size_t __len) { + return basic_string<char>(__str, __len); +} + +# if _LIBCPP_HAS_WIDE_CHARACTERS +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<wchar_t> operator""s(const wchar_t* __str, size_t __len) { + return basic_string<wchar_t>(__str, __len); +} +# endif + +# if _LIBCPP_HAS_CHAR8_T +[[__nodiscard__]] inline + _LIBCPP_HIDE_FROM_ABI constexpr basic_string<char8_t> operator""s(const char8_t* __str, size_t __len) { + return basic_string<char8_t>(__str, __len); +} +# endif + +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI +_LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char16_t> operator""s(const char16_t* __str, size_t __len) { + return basic_string<char16_t>(__str, __len); +} + +[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string<char32_t> +operator""s(const char32_t* __str, size_t __len) { + return basic_string<char32_t>(__str, __len); +} +} // namespace string_literals +} // namespace literals + +# if _LIBCPP_STD_VER >= 20 +template <> +inline constexpr bool __format::__enable_insertable<std::basic_string<char>> = true; +# if _LIBCPP_HAS_WIDE_CHARACTERS +template <> +inline constexpr bool __format::__enable_insertable<std::basic_string<wchar_t>> = true; +# endif +# endif + +# endif + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 +# include <algorithm> +# include <concepts> +# include <cstdlib> +# include <iterator> +# include <new> +# include <optional> +# include <type_traits> +# include <typeinfo> +# include <utility> +# endif +#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) + +#endif // _LIBCPP_STRING |