entry_pred.hpp

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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
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// of the GNU General Public License as published by the Free Software
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// version.

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// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
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// 3.1, as published by the Free Software Foundation.

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// a copy of the GCC Runtime Library Exception along with this program;
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// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
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/**
 * @file binary_heap_/entry_pred.hpp
 * Contains an implementation class for a binary_heap.
 */

#ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP
#define PB_DS_BINARY_HEAP_ENTRY_PRED_HPP

namespace __gnu_pbds
{
  namespace detail
  {
    /// Entry predicate primary class template.
    template<typename _VTp, typename Pred, typename _Alloc, bool No_Throw>
      struct entry_pred;

    /// Specialization, true.
    template<typename _VTp, typename Pred, typename _Alloc>
      struct entry_pred<_VTp, Pred, _Alloc, true>
      {
    typedef Pred                        type;
      };

    /// Specialization, false.
    template<typename _VTp, typename Pred, typename _Alloc>
      struct entry_pred<_VTp, Pred, _Alloc, false>
      {
      private:
    typedef typename _Alloc::template rebind<_VTp>      __rebind_v;

      public:
    typedef typename __rebind_v::other::const_pointer   entry;

    struct type : public Pred
    {
      inline
      type() { }

      inline
      type(const Pred& other) : Pred(other) { }

      inline bool
      operator()(entry p_v) const
      { return Pred::operator()(*p_v); }
    };
      };
  } // namespace detail
} // namespace __gnu_pbds

#endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP