libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 3, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 00026 00027 // Permission to use, copy, modify, sell, and distribute this software 00028 // is hereby granted without fee, provided that the above copyright 00029 // notice appears in all copies, and that both that copyright notice 00030 // and this permission notice appear in supporting documentation. None 00031 // of the above authors, nor IBM Haifa Research Laboratories, make any 00032 // representation about the suitability of this software for any 00033 // purpose. It is provided "as is" without express or implied 00034 // warranty. 00035 00036 /** 00037 * @file eq_by_less.hpp 00038 * Contains an equivalence function. 00039 */ 00040 00041 #ifndef PB_DS_EQ_BY_LESS_HPP 00042 #define PB_DS_EQ_BY_LESS_HPP 00043 00044 #include <utility> 00045 #include <functional> 00046 #include <vector> 00047 #include <assert.h> 00048 #include <ext/pb_ds/detail/types_traits.hpp> 00049 00050 namespace __gnu_pbds 00051 { 00052 namespace detail 00053 { 00054 /// Equivalence function. 00055 template<typename Key, class Cmp_Fn> 00056 struct eq_by_less : private Cmp_Fn 00057 { 00058 bool 00059 operator()(const Key& r_lhs, const Key& r_rhs) const 00060 { 00061 const bool l = Cmp_Fn::operator()(r_lhs, r_rhs); 00062 const bool g = Cmp_Fn::operator()(r_rhs, r_lhs); 00063 return !(l || g); 00064 } 00065 }; 00066 } // namespace detail 00067 } // namespace __gnu_pbds 00068 00069 #endif // #ifndef PB_DS_EQ_BY_LESS_HPP