1// C++11 <typeindex> -*- C++ -*-
2
3// Copyright (C) 2010-2018 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/typeindex
26 *  This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_TYPEINDEX
30#define _GLIBCXX_TYPEINDEX 1
31
32#pragma GCC system_header
33
34#if __cplusplus < 201103L
35# include <bits/c++0x_warning.h>
36#else
37
38#include <typeinfo>
39
40namespace std _GLIBCXX_VISIBILITY(default)
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44  /**
45   * @brief Class type_index
46   * @ingroup utilities
47   *
48   *  The class type_index provides a simple wrapper for type_info
49   *  which can be used as an index type in associative containers
50   *  (23.6) and in unordered associative containers (23.7).
51   */
52  struct type_index
53  {
54    type_index(const type_info& __rhs) noexcept
55    : _M_target(&__rhs) { }
56
57    bool
58    operator==(const type_index& __rhs) const noexcept
59    { return *_M_target == *__rhs._M_target; }
60
61    bool
62    operator!=(const type_index& __rhs) const noexcept
63    { return *_M_target != *__rhs._M_target; }
64
65    bool
66    operator<(const type_index& __rhs) const noexcept
67    { return _M_target->before(*__rhs._M_target); }
68
69    bool
70    operator<=(const type_index& __rhs) const noexcept
71    { return !__rhs._M_target->before(*_M_target); }
72
73    bool
74    operator>(const type_index& __rhs) const noexcept
75    { return __rhs._M_target->before(*_M_target); }
76
77    bool
78    operator>=(const type_index& __rhs) const noexcept
79    { return !_M_target->before(*__rhs._M_target); }
80
81    size_t
82    hash_code() const noexcept
83    { return _M_target->hash_code(); }
84
85    const char*
86    name() const noexcept
87    { return _M_target->name(); }
88
89  private:
90    const type_info* _M_target;
91  };
92
93  template<typename _Tp> struct hash;
94
95  /// std::hash specialization for type_index.
96  template<>
97    struct hash<type_index>
98    {
99      typedef size_t        result_type;
100      typedef type_index  argument_type;
101
102      size_t
103      operator()(const type_index& __ti) const noexcept
104      { return __ti.hash_code(); }
105    };
106
107_GLIBCXX_END_NAMESPACE_VERSION
108} // namespace std
109
110#endif  // C++11
111
112#endif  // _GLIBCXX_TYPEINDEX
113