libstdc++-v3/include/ext/pb_ds/detail/binary_heap_/entry_cmp.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2014 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
  44 namespace __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