libstdc++

typeindex
Go to the documentation of this file.
1 // C++11 <typeindex> -*- C++ -*-
2
3 // Copyright (C) 2010-2013 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
40 namespace 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
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