eq_by_less.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2015 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
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// of the GNU General Public License as published by the Free Software
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// 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
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// 3.1, as published by the Free Software Foundation.
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// a copy of the GCC Runtime Library Exception along with this program;
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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/**
* @file eq_by_less.hpp
* Contains an equivalence function.
*/
#ifndef PB_DS_EQ_BY_LESS_HPP
#define PB_DS_EQ_BY_LESS_HPP
#include <utility>
#include <functional>
#include <vector>
#include <assert.h>
#include <ext/pb_ds/detail/types_traits.hpp>
namespace __gnu_pbds
{
namespace detail
{
/// Equivalence function.
template<typename Key, class Cmp_Fn>
struct eq_by_less : private Cmp_Fn
{
bool
operator()(const Key& r_lhs, const Key& r_rhs) const
{
const bool l = Cmp_Fn::operator()(r_lhs, r_rhs);
const bool g = Cmp_Fn::operator()(r_rhs, r_lhs);
return !(l || g);
}
};
} // namespace detail
} // namespace __gnu_pbds
#endif // #ifndef PB_DS_EQ_BY_LESS_HPP
vector
types_traits.hpp
__gnu_pbds::detail::eq_by_less
Equivalence function.
Definition: eq_by_less.hpp:56
utility
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition: assoc_container.hpp:51
detail
Definition: hash_prime_size_policy_imp.hpp:43
functional