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+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Joaquin M Lopez Munoz 2006-2009
+//
+// 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/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_INTRUSIVE_DETAIL_EBO_HOLDER_HPP
+#define BOOST_INTRUSIVE_DETAIL_EBO_HOLDER_HPP
+
+#include <boost/intrusive/detail/config_begin.hpp>
+#include <boost/intrusive/detail/mpl.hpp>
+
+namespace boost {
+namespace intrusive {
+namespace detail {
+
+template<typename T, bool IsEmpty = true>
+class ebo_functor_holder_impl
+{
+ public:
+ ebo_functor_holder_impl()
+ {}
+ ebo_functor_holder_impl(const T& t)
+ : t_(t)
+ {}
+ template<class Arg1, class Arg2>
+ ebo_functor_holder_impl(const Arg1& arg1, const Arg2& arg2)
+ : t_(arg1, arg2)
+ {}
+
+ T& get(){return t_;}
+ const T& get()const{return t_;}
+
+ private:
+ T t_;
+};
+
+template<typename T>
+class ebo_functor_holder_impl<T, false>
+ : public T
+{
+ public:
+ ebo_functor_holder_impl()
+ {}
+ ebo_functor_holder_impl(const T& t)
+ : T(t)
+ {}
+ template<class Arg1, class Arg2>
+ ebo_functor_holder_impl(const Arg1& arg1, const Arg2& arg2)
+ : T(arg1, arg2)
+ {}
+
+ T& get(){return *this;}
+ const T& get()const{return *this;}
+};
+
+template<typename T>
+class ebo_functor_holder
+ : public ebo_functor_holder_impl<T, is_unary_or_binary_function<T>::value>
+{
+ private:
+ typedef ebo_functor_holder_impl<T, is_unary_or_binary_function<T>::value> super;
+
+ public:
+ ebo_functor_holder(){}
+ ebo_functor_holder(const T& t)
+ : super(t)
+ {}
+
+ template<class Arg1, class Arg2>
+ ebo_functor_holder(const Arg1& arg1, const Arg2& arg2)
+ : super(arg1, arg2)
+ {}
+
+ ebo_functor_holder& operator=(const ebo_functor_holder& x)
+ {
+ this->get()=x.get();
+ return *this;
+ }
+};
+
+
+} //namespace detail {
+} //namespace intrusive {
+} //namespace boost {
+
+#include <boost/intrusive/detail/config_end.hpp>
+
+#endif //#ifndef BOOST_INTRUSIVE_DETAIL_EBO_HOLDER_HPP