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      1 // -*- C++ -*-
      2 
      3 // Copyright (C) 2005-2013 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
     86