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#include <__assert> // all public C++ headers provide the assertion handler
49#include <__config>
50#include <__functional/unary_function.h>
51#include <typeinfo>
52#include <version>
53
54// standard-mandated includes
55#include <compare>
56
57#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
58#  pragma GCC system_header
59#endif
60
61_LIBCPP_BEGIN_NAMESPACE_STD
62
63class _LIBCPP_TEMPLATE_VIS type_index {
64  const type_info* __t_;
65
66public:
67  _LIBCPP_HIDE_FROM_ABI type_index(const type_info& __y) _NOEXCEPT : __t_(&__y) {}
68
69  _LIBCPP_HIDE_FROM_ABI bool operator==(const type_index& __y) const _NOEXCEPT { return *__t_ == *__y.__t_; }
70#if _LIBCPP_STD_VER <= 17
71  _LIBCPP_HIDE_FROM_ABI bool operator!=(const type_index& __y) const _NOEXCEPT { return *__t_ != *__y.__t_; }
72#endif
73  _LIBCPP_HIDE_FROM_ABI bool operator<(const type_index& __y) const _NOEXCEPT { return __t_->before(*__y.__t_); }
74  _LIBCPP_HIDE_FROM_ABI bool operator<=(const type_index& __y) const _NOEXCEPT { return !__y.__t_->before(*__t_); }
75  _LIBCPP_HIDE_FROM_ABI bool operator>(const type_index& __y) const _NOEXCEPT { return __y.__t_->before(*__t_); }
76  _LIBCPP_HIDE_FROM_ABI bool operator>=(const type_index& __y) const _NOEXCEPT { return !__t_->before(*__y.__t_); }
77#if _LIBCPP_STD_VER >= 20
78  _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const type_index& __y) const noexcept {
79    if (*__t_ == *__y.__t_)
80      return strong_ordering::equal;
81    if (__t_->before(*__y.__t_))
82      return strong_ordering::less;
83    return strong_ordering::greater;
84  }
85#endif
86
87  _LIBCPP_HIDE_FROM_ABI size_t hash_code() const _NOEXCEPT { return __t_->hash_code(); }
88  _LIBCPP_HIDE_FROM_ABI const char* name() const _NOEXCEPT { return __t_->name(); }
89};
90
91template <class _Tp>
92struct _LIBCPP_TEMPLATE_VIS hash;
93
94template <>
95struct _LIBCPP_TEMPLATE_VIS hash<type_index> : public __unary_function<type_index, size_t> {
96  _LIBCPP_HIDE_FROM_ABI size_t operator()(type_index __index) const _NOEXCEPT { return __index.hash_code(); }
97};
98
99_LIBCPP_END_NAMESPACE_STD
100
101#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
102#  include <iosfwd>
103#  include <new>
104#  include <utility>
105#endif
106
107#endif // _LIBCPP_TYPEINDEX
108