libstdc++
typeindex
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1 // C++0x typeindex -*- C++ -*-
2 
3 // Copyright (C) 2010 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 #ifndef __GXX_EXPERIMENTAL_CXX0X__
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 The class type_index provides a simple wrapper for type_info
46  which can be used as an index type in associative containers (23.6)
47  and in unordered associative containers (23.7).
48  */
49  struct type_index
50  {
51  type_index(const type_info& __rhs)
52  : _M_target(&__rhs) { }
53 
54  bool
55  operator==(const type_index& __rhs) const
56  { return *_M_target == *__rhs._M_target; }
57 
58  bool
59  operator!=(const type_index& __rhs) const
60  { return *_M_target != *__rhs._M_target; }
61 
62  bool
63  operator<(const type_index& __rhs) const
64  { return _M_target->before(*__rhs._M_target); }
65 
66  bool
67  operator<=(const type_index& __rhs) const
68  { return !__rhs._M_target->before(*_M_target); }
69 
70  bool
71  operator>(const type_index& __rhs) const
72  { return __rhs._M_target->before(*_M_target); }
73 
74  bool
75  operator>=(const type_index& __rhs) const
76  { return !_M_target->before(*__rhs._M_target); }
77 
78  size_t
79  hash_code() const
80  { return _M_target->hash_code(); }
81 
82  const char*
83  name() const
84  { return _M_target->name(); }
85 
86  private:
87  const type_info* _M_target;
88  };
89 
90  template<typename _Tp> struct hash;
91 
92  /// std::hash specialization for type_index.
93  template<>
94  struct hash<type_index>
95  {
96  typedef size_t result_type;
97  typedef type_index argument_type;
98 
99  size_t
100  operator()(const type_index& __ti) const
101  { return __ti.hash_code(); }
102  };
103 
104 _GLIBCXX_END_NAMESPACE_VERSION
105 } // namespace
106 
107 #endif // __GXX_EXPERIMENTAL_CXX0X__
108 
109 #endif // _GLIBCXX_TYPEINDEX