libstdc++-v3/include/std/source_location

   1 // <source_location> -*- C++ -*-
   2
   3 // Copyright (C) 2020-2021 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
  35 namespace 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
  47   public:
  48
  49     // [support.srcloc.cons], creation
  50     static consteval source_location
  51     current(const void* __p = __builtin_source_location()) noexcept
  52     {
  53       source_location __ret;
  54       __ret._M_impl = static_cast <const __impl*>(__p);
  55       return __ret;
  56     }
  57
  58     constexpr source_location() noexcept { }
  59
  60     // [support.srcloc.obs], observers
  61     constexpr uint_least32_t
  62     line() const noexcept
  63     { return _M_impl ? _M_impl->_M_line : 0u; }
  64
  65     constexpr uint_least32_t
  66     column() const noexcept
  67     { return _M_impl ? _M_impl->_M_column : 0u; }
  68
  69     constexpr const char*
  70     file_name() const noexcept
  71     { return _M_impl ? _M_impl->_M_file_name : ""; }
  72
  73     constexpr const char*
  74     function_name() const noexcept
  75     { return _M_impl ? _M_impl->_M_function_name : ""; }
  76
  77   private:
  78     struct __impl
  79     {
  80       const char* _M_file_name;
  81       const char* _M_function_name;
  82       unsigned _M_line;
  83       unsigned _M_column;
  84     };
  85
  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