libstdc++
entry_pred.hpp
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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 binary_heap_/entry_pred.hpp
00038  * Contains an implementation class for a binary_heap.
00039  */
00040 
00041 #ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP
00042 #define PB_DS_BINARY_HEAP_ENTRY_PRED_HPP
00043 
00044 namespace __gnu_pbds
00045 {
00046   namespace detail
00047   {
00048     /// Entry predicate primary class template.
00049     template<typename _VTp, typename Pred, typename _Alloc, bool No_Throw>
00050       struct entry_pred;
00051 
00052     /// Specialization, true.
00053     template<typename _VTp, typename Pred, typename _Alloc>
00054       struct entry_pred<_VTp, Pred, _Alloc, true>
00055       {
00056     typedef Pred                        type;
00057       };
00058 
00059     /// Specialization, false.
00060     template<typename _VTp, typename Pred, typename _Alloc>
00061       struct entry_pred<_VTp, Pred, _Alloc, false>
00062       {
00063       private:
00064     typedef typename _Alloc::template rebind<_VTp>      __rebind_v;
00065 
00066       public:
00067     typedef typename __rebind_v::other::const_pointer   entry;
00068 
00069     struct type : public Pred
00070     {
00071       inline
00072       type() { }
00073 
00074       inline
00075       type(const Pred& other) : Pred(other) { }
00076 
00077       inline bool
00078       operator()(entry p_v) const
00079       { return Pred::operator()(*p_v); }
00080     };
00081       };
00082   } // namespace detail
00083 } // namespace __gnu_pbds
00084 
00085 #endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP