From 3ad39e9878310e5317ee73c9b353c1e2c1c5c4ee Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Sat, 11 Jul 2026 22:48:30 +0800 Subject: lib: establish Zircon libc++ and KTL foundation --- lib/ktl/include/cmath | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 lib/ktl/include/cmath (limited to 'lib/ktl/include/cmath') diff --git a/lib/ktl/include/cmath b/lib/ktl/include/cmath new file mode 100644 index 0000000..13b8e6b --- /dev/null +++ b/lib/ktl/include/cmath @@ -0,0 +1,53 @@ +// Copyright 2021 The Fuchsia Authors +// +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file or at +// https://opensource.org/licenses/MIT + +#ifndef ZIRCON_KERNEL_LIB_KTL_INCLUDE_CMATH_ +#define ZIRCON_KERNEL_LIB_KTL_INCLUDE_CMATH_ + +// The kernel doesn't want this file but some libc++ headers we need +// wind up including it. They don't actually most of the math +// declarations except under #if conditions that aren't true. + +#include <__config> +#include + +_LIBCPP_BEGIN_NAMESPACE_STD + +// These are used in templates that won't ever be instantiated in kernel code. + +template +constexpr bool isinf(T&& x) { + static_assert(!is_same_v, "must not be instantiated in kernel code"); + return false; +} + +template +constexpr bool isnan(T&& x) { + static_assert(!is_same_v, "must not be instantiated in kernel code"); + return false; +} + +template +constexpr bool signbit(T&& x) { + static_assert(!is_same_v, "must not be instantiated in kernel code"); + return false; +} + +template +constexpr T frexp(T&& x, int* exponent) { + static_assert(!is_same_v, "must not be instantiated in kernel code"); + return x; +} + +template +constexpr auto ceil(T&& x) { + static_assert(!is_same_v, "must not be instantiated in kernel code"); + return x; +} + +_LIBCPP_END_NAMESPACE_STD + +#endif // ZIRCON_KERNEL_LIB_KTL_INCLUDE_CMATH_ -- cgit v1.2.3