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