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
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
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
93