74 lines · c
1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H11#define _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H12 13#include <__assert>14#include <__charconv/chars_format.h>15#include <__charconv/from_chars_result.h>16#include <__config>17#include <__cstddef/ptrdiff_t.h>18#include <__system_error/errc.h>19 20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)21# pragma GCC system_header22#endif23 24_LIBCPP_PUSH_MACROS25#include <__undef_macros>26 27_LIBCPP_BEGIN_NAMESPACE_STD28 29#if _LIBCPP_STD_VER >= 1730 31template <class _Fp>32struct __from_chars_result {33 _Fp __value;34 ptrdiff_t __n;35 errc __ec;36};37 38template <class _Fp>39_LIBCPP_EXPORTED_FROM_ABI __from_chars_result<_Fp> __from_chars_floating_point(40 _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);41 42extern template __from_chars_result<float> __from_chars_floating_point(43 _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);44 45extern template __from_chars_result<double> __from_chars_floating_point(46 _LIBCPP_NOESCAPE const char* __first, _LIBCPP_NOESCAPE const char* __last, chars_format __fmt);47 48template <class _Fp>49_LIBCPP_HIDE_FROM_ABI from_chars_result50__from_chars(const char* __first, const char* __last, _Fp& __value, chars_format __fmt) {51 __from_chars_result<_Fp> __r = std::__from_chars_floating_point<_Fp>(__first, __last, __fmt);52 if (__r.__ec != errc::invalid_argument)53 __value = __r.__value;54 return {__first + __r.__n, __r.__ec};55}56 57_LIBCPP_AVAILABILITY_FROM_CHARS_FLOATING_POINT _LIBCPP_HIDE_FROM_ABI inline from_chars_result58from_chars(const char* __first, const char* __last, float& __value, chars_format __fmt = chars_format::general) {59 return std::__from_chars<float>(__first, __last, __value, __fmt);60}61 62_LIBCPP_AVAILABILITY_FROM_CHARS_FLOATING_POINT _LIBCPP_HIDE_FROM_ABI inline from_chars_result63from_chars(const char* __first, const char* __last, double& __value, chars_format __fmt = chars_format::general) {64 return std::__from_chars<double>(__first, __last, __value, __fmt);65}66 67#endif // _LIBCPP_STD_VER >= 1768 69_LIBCPP_END_NAMESPACE_STD70 71_LIBCPP_POP_MACROS72 73#endif // _LIBCPP___CHARCONV_FROM_CHARS_FLOATING_POINT_H74