// -*- C++ -*-
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// Copyright (C) 2005-2020 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 terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file hash_eq_fn.hpp
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* Contains 2 equivalence functions, one employing a hash value,
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* and one ignoring it.
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*/
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#ifndef PB_DS_HASH_EQ_FN_HPP
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#define PB_DS_HASH_EQ_FN_HPP
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#include <utility>
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#include <ext/pb_ds/detail/types_traits.hpp>
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#include <debug/debug.h>
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namespace __gnu_pbds
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{
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namespace detail
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{
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/// Primary template.
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template<typename Key, typename Eq_Fn, typename _Alloc, bool Store_Hash>
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struct hash_eq_fn;
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/// Specialization 1 - The client requests that hash values not be stored.
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template<typename Key, typename Eq_Fn, typename _Alloc>
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struct hash_eq_fn<Key, Eq_Fn, _Alloc, false> : public Eq_Fn
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{
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typedef Eq_Fn eq_fn_base;
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typedef typename rebind_traits<_Alloc, Key>::const_reference
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key_const_reference;
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hash_eq_fn() { }
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hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { }
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bool
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operator()(key_const_reference r_lhs_key,
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key_const_reference r_rhs_key) const
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{ return eq_fn_base::operator()(r_lhs_key, r_rhs_key); }
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void
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swap(const hash_eq_fn& other)
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{ std::swap((Eq_Fn&)(*this), (Eq_Fn&)other); }
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};
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/// Specialization 2 - The client requests that hash values be stored.
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template<typename Key, class Eq_Fn, class _Alloc>
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struct hash_eq_fn<Key, Eq_Fn, _Alloc, true> : public Eq_Fn
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{
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typedef typename _Alloc::size_type size_type;
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typedef Eq_Fn eq_fn_base;
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typedef typename rebind_traits<_Alloc, Key>::const_reference
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key_const_reference;
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hash_eq_fn() { }
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hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { }
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bool
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operator()(key_const_reference r_lhs_key, size_type lhs_hash,
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key_const_reference r_rhs_key, size_type rhs_hash) const
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{
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_GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key)
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|| lhs_hash == rhs_hash);
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return (lhs_hash == rhs_hash &&
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eq_fn_base::operator()(r_lhs_key, r_rhs_key));
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}
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void
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swap(const hash_eq_fn& other)
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{ std::swap((Eq_Fn&)(*this), (Eq_Fn&)(other)); }
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};
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} // namespace detail
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} // namespace __gnu_pbds
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#endif
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