entry_cmp.hpp

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// -*- C++ -*-
 
// Copyright (C) 2005-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.
 
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
 
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <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
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
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/**
 * @file binary_heap_/entry_cmp.hpp
 * Contains an implementation class for a binary_heap.
 */
 
#ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
#define PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
 
namespace __gnu_pbds
{
  namespace detail
  {
    /// Entry compare, primary template.
    template<typename _VTp, typename Cmp_Fn, typename _Alloc, bool No_Throw>
      struct entry_cmp;
 
    /// Specialization, true.
    template<typename _VTp, typename Cmp_Fn, typename _Alloc>
      struct entry_cmp<_VTp, Cmp_Fn, _Alloc, true>
      {
        /// Compare.
        typedef Cmp_Fn                                          type;
      };
 
    /// Specialization, false.
    template<typename _VTp, typename Cmp_Fn, typename _Alloc>
      struct entry_cmp<_VTp, Cmp_Fn, _Alloc, false>
      {
      private:
        typedef rebind_traits<_Alloc, _VTp>             __rebind_v;
 
      public:
        typedef typename __rebind_v::const_pointer      entry;
 
        /// Compare plus entry.
        struct type : public Cmp_Fn
        {
          type() { }
 
          type(const Cmp_Fn& other) : Cmp_Fn(other) { }
 
          bool
          operator()(entry lhs, entry rhs) const
          { return Cmp_Fn::operator()(*lhs, *rhs); }
        };
      };
  } // namespace detail
} // namespace __gnu_pbds
 
#endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP