1// <source_location> -*- C++ -*- 2 3// Copyright (C) 2020-2022 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 3, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25/** @file include/source_location 26 * This is a Standard C++ Library header. 27 */ 28 29#ifndef _GLIBCXX_SRCLOC 30#define _GLIBCXX_SRCLOC 1 31 32#if __cplusplus > 201703L && __has_builtin(__builtin_source_location) 33#include <bits/c++config.h> 34 35namespace std 36{ 37_GLIBCXX_BEGIN_NAMESPACE_VERSION 38 39#define __cpp_lib_source_location 201907L 40 41 /// A class that describes a location in source code. 42 struct source_location 43 { 44 private: 45 using uint_least32_t = __UINT_LEAST32_TYPE__; 46 struct __impl 47 { 48 const char* _M_file_name; 49 const char* _M_function_name; 50 unsigned _M_line; 51 unsigned _M_column; 52 }; 53 using __builtin_ret_type = decltype(__builtin_source_location()); 54 55 public: 56 57 // [support.srcloc.cons], creation 58 static consteval source_location 59 current(__builtin_ret_type __p = __builtin_source_location()) noexcept 60 { 61 source_location __ret; 62 __ret._M_impl = static_cast <const __impl*>(__p); 63 return __ret; 64 } 65 66 constexpr source_location() noexcept { } 67 68 // [support.srcloc.obs], observers 69 constexpr uint_least32_t 70 line() const noexcept 71 { return _M_impl ? _M_impl->_M_line : 0u; } 72 73 constexpr uint_least32_t 74 column() const noexcept 75 { return _M_impl ? _M_impl->_M_column : 0u; } 76 77 constexpr const char* 78 file_name() const noexcept 79 { return _M_impl ? _M_impl->_M_file_name : ""; } 80 81 constexpr const char* 82 function_name() const noexcept 83 { return _M_impl ? _M_impl->_M_function_name : ""; } 84 85 private: 86 const __impl* _M_impl = nullptr; 87 }; 88 89_GLIBCXX_END_NAMESPACE_VERSION 90} // namespace std 91#endif // C++20 && __builtin_source_location 92#endif // _GLIBCXX_SRCLOC 93