156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
74 lines
2.5 KiB
C++
Vendored
74 lines
2.5 KiB
C++
Vendored
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H
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#define _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H
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#include <__assert>
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#include <__charconv/chars_format.h>
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#include <__charconv/from_chars_result.h>
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#include <__config>
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#include <__cstddef/ptrdiff_t.h>
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#include <__system_error/errc.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 17
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template <class _Fp>
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struct __from_chars_result {
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_Fp __value;
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ptrdiff_t __n;
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errc __ec;
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};
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template <class _Fp>
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_LIBCPP_EXPORTED_FROM_ABI __from_chars_result<_Fp> __from_chars_floating_point(
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_LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
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extern template __from_chars_result<float> __from_chars_floating_point(
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_LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
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extern template __from_chars_result<double> __from_chars_floating_point(
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_LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);
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template <class _Fp>
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_LIBCPP_HIDE_FROM_ABI from_chars_result
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__from_chars(const char* __first, const char* __last, _Fp& __value, chars_format __fmt) {
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__from_chars_result<_Fp> __r = std::__from_chars_floating_point<_Fp>(__first, __last, __fmt);
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if (__r.__ec != errc::invalid_argument)
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__value = __r.__value;
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return {__first + __r.__n, __r.__ec};
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}
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_LIBCPP_AVAILABILITY_FROM_CHARS_FLOATING_POINT _LIBCPP_HIDE_FROM_ABI inline from_chars_result
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from_chars(const char* __first, const char* __last, float& __value, chars_format __fmt = chars_format::general) {
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return std::__from_chars<float>(__first, __last, __value, __fmt);
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}
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_LIBCPP_AVAILABILITY_FROM_CHARS_FLOATING_POINT _LIBCPP_HIDE_FROM_ABI inline from_chars_result
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from_chars(const char* __first, const char* __last, double& __value, chars_format __fmt = chars_format::general) {
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return std::__from_chars<double>(__first, __last, __value, __fmt);
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}
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H
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