From 8cace3f05003c6cb4d38c36890055f03151c2ad4 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Fri, 16 Oct 2026 02:39:56 +0800
Subject: Remove old code

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>
---
 third_party/libcxx/include/c++/v1/codecvt | 606 ------------------------------
 1 file changed, 606 deletions(-)
 delete mode 100644 third_party/libcxx/include/c++/v1/codecvt

(limited to 'third_party/libcxx/include/c++/v1/codecvt')

diff --git a/third_party/libcxx/include/c++/v1/codecvt b/third_party/libcxx/include/c++/v1/codecvt
deleted file mode 100644
index 33ade1d..0000000
--- a/third_party/libcxx/include/c++/v1/codecvt
+++ /dev/null
@@ -1,606 +0,0 @@
-// -*- 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_CODECVT
-#define _LIBCPP_CODECVT
-
-/*
-    codecvt synopsis
-
-namespace std
-{
-
-enum codecvt_mode
-{
-    consume_header = 4,
-    generate_header = 2,
-    little_endian = 1
-};
-
-template <class Elem, unsigned long Maxcode = 0x10ffff,
-          codecvt_mode Mode = (codecvt_mode)0>
-class codecvt_utf8
-    : public codecvt<Elem, char, mbstate_t>
-{
-    explicit codecvt_utf8(size_t refs = 0);
-    ~codecvt_utf8();
-};
-
-template <class Elem, unsigned long Maxcode = 0x10ffff,
-          codecvt_mode Mode = (codecvt_mode)0>
-class codecvt_utf16
-    : public codecvt<Elem, char, mbstate_t>
-{
-    explicit codecvt_utf16(size_t refs = 0);
-    ~codecvt_utf16();
-};
-
-template <class Elem, unsigned long Maxcode = 0x10ffff,
-          codecvt_mode Mode = (codecvt_mode)0>
-class codecvt_utf8_utf16
-    : public codecvt<Elem, char, mbstate_t>
-{
-    explicit codecvt_utf8_utf16(size_t refs = 0);
-    ~codecvt_utf8_utf16();
-};
-
-}  // std
-
-*/
-
-#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-#  include <__cxx03/codecvt>
-#else
-#  include <__config>
-
-#  if _LIBCPP_HAS_LOCALIZATION
-
-#    include <__locale>
-#    include <version>
-
-#    if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#      pragma GCC system_header
-#    endif
-
-#    if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 };
-
-// codecvt_utf8
-
-template <class _Elem>
-class __codecvt_utf8;
-
-#      if _LIBCPP_HAS_WIDE_CHARACTERS
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  codecvt_mode __mode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-public:
-  typedef wchar_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-#      endif // _LIBCPP_HAS_WIDE_CHARACTERS
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char16_t> : public codecvt<char16_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char16_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char32_t> : public codecvt<char32_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char32_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8 : public __codecvt_utf8<_Elem> {
-public:
-  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8(size_t __refs = 0) : __codecvt_utf8<_Elem>(__refs, _Maxcode, _Mode) {}
-
-  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8() {}
-};
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-
-// codecvt_utf16
-
-template <class _Elem, bool _LittleEndian>
-class __codecvt_utf16;
-
-#      if _LIBCPP_HAS_WIDE_CHARACTERS
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, false> : public codecvt<wchar_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  codecvt_mode __mode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-public:
-  typedef wchar_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, true> : public codecvt<wchar_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  codecvt_mode __mode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-public:
-  typedef wchar_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-#      endif // _LIBCPP_HAS_WIDE_CHARACTERS
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, false> : public codecvt<char16_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char16_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, true> : public codecvt<char16_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char16_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, false> : public codecvt<char32_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char32_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, true> : public codecvt<char32_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char32_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf16 : public __codecvt_utf16<_Elem, _Mode & little_endian> {
-public:
-  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf16(size_t __refs = 0)
-      : __codecvt_utf16<_Elem, _Mode & little_endian>(__refs, _Maxcode, _Mode) {}
-
-  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf16() {}
-};
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-
-// codecvt_utf8_utf16
-
-template <class _Elem>
-class __codecvt_utf8_utf16;
-
-#      if _LIBCPP_HAS_WIDE_CHARACTERS
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  codecvt_mode __mode_;
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-public:
-  typedef wchar_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-#      endif // _LIBCPP_HAS_WIDE_CHARACTERS
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char32_t> : public codecvt<char32_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char32_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char16_t> : public codecvt<char16_t, char, mbstate_t> {
-  unsigned long __maxcode_;
-  codecvt_mode __mode_;
-
-public:
-  typedef char16_t intern_type;
-  typedef char extern_type;
-  typedef mbstate_t state_type;
-
-  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
-      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
-  _LIBCPP_SUPPRESS_DEPRECATED_POP
-
-protected:
-  result do_out(state_type& __st,
-                const intern_type* __frm,
-                const intern_type* __frm_end,
-                const intern_type*& __frm_nxt,
-                extern_type* __to,
-                extern_type* __to_end,
-                extern_type*& __to_nxt) const override;
-  result do_in(state_type& __st,
-               const extern_type* __frm,
-               const extern_type* __frm_end,
-               const extern_type*& __frm_nxt,
-               intern_type* __to,
-               intern_type* __to_end,
-               intern_type*& __to_nxt) const override;
-  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-  int do_encoding() const _NOEXCEPT override;
-  bool do_always_noconv() const _NOEXCEPT override;
-  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-  int do_max_length() const _NOEXCEPT override;
-};
-
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8_utf16 : public __codecvt_utf8_utf16<_Elem> {
-public:
-  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8_utf16(size_t __refs = 0)
-      : __codecvt_utf8_utf16<_Elem>(__refs, _Maxcode, _Mode) {}
-
-  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8_utf16() {}
-};
-_LIBCPP_SUPPRESS_DEPRECATED_POP
-
-_LIBCPP_END_NAMESPACE_STD
-
-#    endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
-
-#  endif // _LIBCPP_HAS_LOCALIZATION
-
-#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#    include <atomic>
-#    include <concepts>
-#    include <cstddef>
-#    include <cstdlib>
-#    include <cstring>
-#    include <initializer_list>
-#    include <iosfwd>
-#    include <limits>
-#    include <mutex>
-#    include <new>
-#    include <optional>
-#    include <stdexcept>
-#    include <type_traits>
-#    include <typeinfo>
-#  endif
-#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-
-#endif // _LIBCPP_CODECVT
-- 
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