// C++11 <typeindex> -*- C++ -*-
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// Copyright (C) 2010-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/typeindex
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_TYPEINDEX
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#define _GLIBCXX_TYPEINDEX 1
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#pragma GCC system_header
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <typeinfo>
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#if __cplusplus > 201703L
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# include <compare>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @brief Class type_index
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* @ingroup utilities
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*
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* The class type_index provides a simple wrapper for type_info
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* which can be used as an index type in associative containers
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* (23.6) and in unordered associative containers (23.7).
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*/
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struct type_index
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{
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type_index(const type_info& __rhs) noexcept
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: _M_target(&__rhs) { }
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bool
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operator==(const type_index& __rhs) const noexcept
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{ return *_M_target == *__rhs._M_target; }
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#if ! __cpp_lib_three_way_comparison
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bool
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operator!=(const type_index& __rhs) const noexcept
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{ return *_M_target != *__rhs._M_target; }
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#endif
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bool
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operator<(const type_index& __rhs) const noexcept
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{ return _M_target->before(*__rhs._M_target); }
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bool
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operator<=(const type_index& __rhs) const noexcept
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{ return !__rhs._M_target->before(*_M_target); }
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bool
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operator>(const type_index& __rhs) const noexcept
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{ return __rhs._M_target->before(*_M_target); }
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bool
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operator>=(const type_index& __rhs) const noexcept
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{ return !_M_target->before(*__rhs._M_target); }
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#if __cpp_lib_three_way_comparison
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strong_ordering
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operator<=>(const type_index& __rhs) const noexcept
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{
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if (*_M_target == *__rhs._M_target)
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return strong_ordering::equal;
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if (_M_target->before(*__rhs._M_target))
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return strong_ordering::less;
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return strong_ordering::greater;
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}
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#endif
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size_t
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hash_code() const noexcept
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{ return _M_target->hash_code(); }
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const char*
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name() const noexcept
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{ return _M_target->name(); }
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private:
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const type_info* _M_target;
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};
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template<typename _Tp> struct hash;
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/// std::hash specialization for type_index.
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template<>
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struct hash<type_index>
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{
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typedef size_t result_type;
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typedef type_index argument_type;
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size_t
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operator()(const type_index& __ti) const noexcept
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{ return __ti.hash_code(); }
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // C++11
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#endif // _GLIBCXX_TYPEINDEX
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