xref: /llvm-project/libcxx/include/typeindex (revision b9a2658a3e8bd13b0f9e7a8a440832a95b377216) 
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_TYPEINDEX
11#define _LIBCPP_TYPEINDEX
12
13/*
14
15    typeindex synopsis
16
17namespace std
18{
19
20class type_index
21{
22public:
23    type_index(const type_info& rhs) noexcept;
24
25    bool operator==(const type_index& rhs) const noexcept;
26    bool operator!=(const type_index& rhs) const noexcept; // removed in C++20
27    bool operator< (const type_index& rhs) const noexcept;
28    bool operator<=(const type_index& rhs) const noexcept;
29    bool operator> (const type_index& rhs) const noexcept;
30    bool operator>=(const type_index& rhs) const noexcept;
31    strong_ordering operator<=>(const type_index& rhs) const noexcept; // C++20
32
33    size_t hash_code() const noexcept;
34    const char* name() const noexcept;
35};
36
37template <>
38struct hash<type_index>
39    : public unary_function<type_index, size_t>
40{
41    size_t operator()(type_index index) const noexcept;
42};
43
44}  // std
45
46*/
47
48#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
49#  include <__cxx03/typeindex>
50#else
51#  include <__config>
52#  include <__functional/unary_function.h>
53#  include <typeinfo>
54#  include <version>
55
56// standard-mandated includes
57#  include <compare>
58
59#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
60#    pragma GCC system_header
61#  endif
62
63_LIBCPP_BEGIN_NAMESPACE_STD
64
65class _LIBCPP_TEMPLATE_VIS type_index {
66  const type_info* __t_;
67
68public:
69  _LIBCPP_HIDE_FROM_ABI type_index(const type_info& __y) _NOEXCEPT : __t_(&__y) {}
70
71  _LIBCPP_HIDE_FROM_ABI bool operator==(const type_index& __y) const _NOEXCEPT { return *__t_ == *__y.__t_; }
72#  if _LIBCPP_STD_VER <= 17
73  _LIBCPP_HIDE_FROM_ABI bool operator!=(const type_index& __y) const _NOEXCEPT { return *__t_ != *__y.__t_; }
74#  endif
75  _LIBCPP_HIDE_FROM_ABI bool operator<(const type_index& __y) const _NOEXCEPT { return __t_->before(*__y.__t_); }
76  _LIBCPP_HIDE_FROM_ABI bool operator<=(const type_index& __y) const _NOEXCEPT { return !__y.__t_->before(*__t_); }
77  _LIBCPP_HIDE_FROM_ABI bool operator>(const type_index& __y) const _NOEXCEPT { return __y.__t_->before(*__t_); }
78  _LIBCPP_HIDE_FROM_ABI bool operator>=(const type_index& __y) const _NOEXCEPT { return !__t_->before(*__y.__t_); }
79#  if _LIBCPP_STD_VER >= 20
80  _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const type_index& __y) const noexcept {
81    if (*__t_ == *__y.__t_)
82      return strong_ordering::equal;
83    if (__t_->before(*__y.__t_))
84      return strong_ordering::less;
85    return strong_ordering::greater;
86  }
87#  endif
88
89  _LIBCPP_HIDE_FROM_ABI size_t hash_code() const _NOEXCEPT { return __t_->hash_code(); }
90  _LIBCPP_HIDE_FROM_ABI const char* name() const _NOEXCEPT { return __t_->name(); }
91};
92
93template <class _Tp>
94struct _LIBCPP_TEMPLATE_VIS hash;
95
96template <>
97struct _LIBCPP_TEMPLATE_VIS hash<type_index> : public __unary_function<type_index, size_t> {
98  _LIBCPP_HIDE_FROM_ABI size_t operator()(type_index __index) const _NOEXCEPT { return __index.hash_code(); }
99};
100
101_LIBCPP_END_NAMESPACE_STD
102
103#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
104#    include <cstddef>
105#    include <iosfwd>
106#    include <new>
107#    include <utility>
108#  endif
109#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
110
111#endif // _LIBCPP_TYPEINDEX
112