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// C++11 <typeindex> -*- C++ -*-
// Copyright (C) 2010-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/typeindex
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_TYPEINDEX
#define _GLIBCXX_TYPEINDEX 1
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <typeinfo>
#if __cplusplus > 201703L
# include <compare>
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @brief Class type_index
* @ingroup utilities
*
* The class type_index provides a simple wrapper for type_info
* which can be used as an index type in associative containers
* (23.6) and in unordered associative containers (23.7).
*/
struct type_index
{
type_index(const type_info& __rhs) noexcept
: _M_target(&__rhs) { }
bool
operator==(const type_index& __rhs) const noexcept
{ return *_M_target == *__rhs._M_target; }
#if ! __cpp_lib_three_way_comparison
bool
operator!=(const type_index& __rhs) const noexcept
{ return *_M_target != *__rhs._M_target; }
#endif
bool
operator<(const type_index& __rhs) const noexcept
{ return _M_target->before(*__rhs._M_target); }
bool
operator<=(const type_index& __rhs) const noexcept
{ return !__rhs._M_target->before(*_M_target); }
bool
operator>(const type_index& __rhs) const noexcept
{ return __rhs._M_target->before(*_M_target); }
bool
operator>=(const type_index& __rhs) const noexcept
{ return !_M_target->before(*__rhs._M_target); }
#if __cpp_lib_three_way_comparison
strong_ordering
operator<=>(const type_index& __rhs) const noexcept
{
if (*_M_target == *__rhs._M_target)
return strong_ordering::equal;
if (_M_target->before(*__rhs._M_target))
return strong_ordering::less;
return strong_ordering::greater;
}
#endif
size_t
hash_code() const noexcept
{ return _M_target->hash_code(); }
const char*
name() const noexcept
{ return _M_target->name(); }
private:
const type_info* _M_target;
};
template<typename _Tp> struct hash;
/// std::hash specialization for type_index.
template<>
struct hash<type_index>
{
typedef size_t result_type;
typedef type_index argument_type;
size_t
operator()(const type_index& __ti) const noexcept
{ return __ti.hash_code(); }
};
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++11
#endif // _GLIBCXX_TYPEINDEX
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