boost/boost/container/detail/compare_functors.hpp

///////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2014-2014. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/container for documentation.
//
///////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_CONTAINER_DETAIL_COMPARE_FUNCTORS_HPP
#define BOOST_CONTAINER_DETAIL_COMPARE_FUNCTORS_HPP

#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif

#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

namespace boost {
namespace container {

template<class Allocator>
class equal_to_value
{
   typedef typename Allocator::value_type value_type;
   const value_type &t_;

   public:
   explicit equal_to_value(const value_type &t)
      :  t_(t)
   {}

   bool operator()(const value_type &t)const
   {  return t_ == t;   }
};

template<class Node, class Pred>
struct value_to_node_compare
   :  Pred
{
   typedef Pred predicate_type;
   typedef Node node_type;

   value_to_node_compare()
      : Pred()
   {}

   explicit value_to_node_compare(Pred pred)
      :  Pred(pred)
   {}

   bool operator()(const Node &a, const Node &b) const
   {  return static_cast<const Pred&>(*this)(a.m_data, b.m_data);  }

   bool operator()(const Node &a) const
   {  return static_cast<const Pred&>(*this)(a.m_data);  }

   bool operator()(const Node &a, const Node &b)
   {  return static_cast<Pred&>(*this)(a.m_data, b.m_data);  }

   bool operator()(const Node &a)
   {  return static_cast<Pred&>(*this)(a.m_data);  }

   predicate_type &       predicate()        { return static_cast<predicate_type&>(*this); }
   const predicate_type & predicate()  const { return static_cast<predicate_type&>(*this); }
};

}  //namespace container {
}  //namespace boost {

#endif   //BOOST_CONTAINER_DETAIL_COMPARE_FUNCTORS_HPP