Added boost header

test/external/boost/graph/overloading.hpp

@@ -0,0 +1,46 @@
+// Copyright 2004 The Trustees of Indiana University.
+
+// Use, modification and distribution is subject to 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)
+
+//  Authors: Douglas Gregor
+//           Andrew Lumsdaine
+
+//
+// This file contains helps that enable concept-based overloading
+// within the Boost Graph Library.
+//
+#ifndef BOOST_GRAPH_OVERLOADING_HPP
+#define BOOST_GRAPH_OVERLOADING_HPP
+
+#include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/utility/enable_if.hpp>
+
+namespace boost {  namespace graph { namespace detail {
+
+struct no_parameter {};
+
+} } } // end namespace boost::graph::detail
+
+#ifndef BOOST_NO_SFINAE
+
+#define BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag, Type)               \
+  typename enable_if_c<(is_base_and_derived<                         \
+                          Tag,                                       \
+                          typename graph_traits<Graph>::traversal_category>::value), \
+                       Type>::type
+
+#define BOOST_GRAPH_ENABLE_IF_MODELS_PARM(Graph, Tag)                   \
+  , BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag,                            \
+                                 ::boost::graph::detail::no_parameter)  \
+    = ::boost::graph::detail::no_parameter()
+
+#else
+
+#define BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag, Type) Type
+#define BOOST_GRAPH_ENABLE_IF_MODELS_PARM(Graph, Tag)
+
+#endif // no SFINAE support
+
+#endif // BOOST_GRAPH_OVERLOADING_HPP