entry_cmp.hpp revision 1.1.1.6
1// -*- C++ -*- 2 3// Copyright (C) 2005-2018 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the terms 7// of the GNU General Public License as published by the Free Software 8// Foundation; either version 3, or (at your option) any later 9// version. 10 11// This library is distributed in the hope that it will be useful, but 12// WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14// General Public License for more details. 15 16// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 26 27// Permission to use, copy, modify, sell, and distribute this software 28// is hereby granted without fee, provided that the above copyright 29// notice appears in all copies, and that both that copyright notice 30// and this permission notice appear in supporting documentation. None 31// of the above authors, nor IBM Haifa Research Laboratories, make any 32// representation about the suitability of this software for any 33// purpose. It is provided "as is" without express or implied 34// warranty. 35 36/** 37 * @file binary_heap_/entry_cmp.hpp 38 * Contains an implementation class for a binary_heap. 39 */ 40 41#ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP 42#define PB_DS_BINARY_HEAP_ENTRY_CMP_HPP 43 44namespace __gnu_pbds 45{ 46 namespace detail 47 { 48 /// Entry compare, primary template. 49 template<typename _VTp, typename Cmp_Fn, typename _Alloc, bool No_Throw> 50 struct entry_cmp; 51 52 /// Specialization, true. 53 template<typename _VTp, typename Cmp_Fn, typename _Alloc> 54 struct entry_cmp<_VTp, Cmp_Fn, _Alloc, true> 55 { 56 /// Compare. 57 typedef Cmp_Fn type; 58 }; 59 60 /// Specialization, false. 61 template<typename _VTp, typename Cmp_Fn, typename _Alloc> 62 struct entry_cmp<_VTp, Cmp_Fn, _Alloc, false> 63 { 64 private: 65 typedef typename _Alloc::template rebind<_VTp> __rebind_v; 66 67 public: 68 typedef typename __rebind_v::other::const_pointer entry; 69 70 /// Compare plus entry. 71 struct type : public Cmp_Fn 72 { 73 type() { } 74 75 type(const Cmp_Fn& other) : Cmp_Fn(other) { } 76 77 bool 78 operator()(entry lhs, entry rhs) const 79 { return Cmp_Fn::operator()(*lhs, *rhs); } 80 }; 81 }; 82 } // namespace detail 83} // namespace __gnu_pbds 84 85#endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP 86