//=======================================================================

 // Copyright 1997, 1998, 1999, 2000 University of Notre Dame.

 // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek

 //

 // 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)

 //=======================================================================

 #ifndef BOOST_GRAPH_DETAIL_IS_SAME_HPP

 #define BOOST_GRAPH_DETAIL_IS_SAME_HPP

 #include <boost/pending/ct_if.hpp>

 namespace boost {

   struct false_tag;

   struct true_tag;

   namespace graph_detail {

 #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

     template <class U, class V>

     struct is_same {

       typedef boost::false_tag is_same_tag; 

     };

     template <class U>

     struct is_same<U, U> {

       typedef boost::true_tag is_same_tag;

     };

 #else

     template <class U, class V>

     struct is_same {

       enum { Unum = U::num, Vnum = V::num };

       typedef typename boost::ct_if< (Unum == Vnum),

                boost::true_tag, boost::false_tag>::type is_same_tag;

     };

 #endif

   } // namespace graph_detail

 } // namespace boost

 #endif