1169691Skan// -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4169691Skan// 5169691Skan// This file is part of the GNU ISO C++ Library. This library is free 6169691Skan// software; you can redistribute it and/or modify it under the terms 7169691Skan// of the GNU General Public License as published by the Free Software 8169691Skan// Foundation; either version 2, or (at your option) any later 9169691Skan// version. 10169691Skan 11169691Skan// This library is distributed in the hope that it will be useful, but 12169691Skan// WITHOUT ANY WARRANTY; without even the implied warranty of 13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14169691Skan// General Public License for more details. 15169691Skan 16169691Skan// You should have received a copy of the GNU General Public License 17169691Skan// along with this library; see the file COPYING. If not, write to 18169691Skan// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19169691Skan// MA 02111-1307, USA. 20169691Skan 21169691Skan// As a special exception, you may use this file as part of a free 22169691Skan// software library without restriction. Specifically, if other files 23169691Skan// instantiate templates or use macros or inline functions from this 24169691Skan// file, or you compile this file and link it with other files to 25169691Skan// produce an executable, this file does not by itself cause the 26169691Skan// resulting executable to be covered by the GNU General Public 27169691Skan// License. This exception does not however invalidate any other 28169691Skan// reasons why the executable file might be covered by the GNU General 29169691Skan// Public License. 30169691Skan 31169691Skan// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32169691Skan 33169691Skan// Permission to use, copy, modify, sell, and distribute this software 34169691Skan// is hereby granted without fee, provided that the above copyright 35169691Skan// notice appears in all copies, and that both that copyright notice 36169691Skan// and this permission notice appear in supporting documentation. None 37169691Skan// of the above authors, nor IBM Haifa Research Laboratories, make any 38169691Skan// representation about the suitability of this software for any 39169691Skan// purpose. It is provided "as is" without express or implied 40169691Skan// warranty. 41169691Skan 42169691Skan/** 43169691Skan * @file eq_by_less.hpp 44169691Skan * Contains an equivalence function. 45169691Skan */ 46169691Skan 47169691Skan#ifndef PB_DS_EQ_BY_LESS_HPP 48169691Skan#define PB_DS_EQ_BY_LESS_HPP 49169691Skan 50169691Skan#include <utility> 51169691Skan#include <functional> 52169691Skan#include <vector> 53169691Skan#include <assert.h> 54169691Skan#include <ext/pb_ds/detail/types_traits.hpp> 55169691Skan 56169691Skannamespace pb_ds 57169691Skan{ 58169691Skan namespace detail 59169691Skan { 60169691Skan template<typename Key, class Cmp_Fn> 61169691Skan struct eq_by_less : private Cmp_Fn 62169691Skan { 63169691Skan bool 64169691Skan operator()(const Key& r_lhs, const Key& r_rhs) const 65169691Skan { 66169691Skan const bool l = Cmp_Fn::operator()(r_lhs, r_rhs); 67169691Skan const bool g = Cmp_Fn::operator()(r_rhs, r_lhs); 68169691Skan return !(l || g); 69169691Skan } 70169691Skan }; 71169691Skan } // namespace detail 72169691Skan} // namespace pb_ds 73169691Skan 74169691Skan#endif // #ifndef PB_DS_EQ_BY_LESS_HPP 75