47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
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// Copyright 2004 The Trustees of Indiana University.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Authors: Douglas Gregor
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// Andrew Lumsdaine
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//
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// This file contains helps that enable concept-based overloading
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// within the Boost Graph Library.
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//
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#ifndef BOOST_GRAPH_OVERLOADING_HPP
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#define BOOST_GRAPH_OVERLOADING_HPP
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace graph { namespace detail {
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struct no_parameter {};
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} } } // end namespace boost::graph::detail
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#ifndef BOOST_NO_SFINAE
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#define BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag, Type) \
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typename enable_if_c<(is_base_and_derived< \
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Tag, \
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typename graph_traits<Graph>::traversal_category>::value), \
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Type>::type
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#define BOOST_GRAPH_ENABLE_IF_MODELS_PARM(Graph, Tag) \
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, BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag, \
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::boost::graph::detail::no_parameter) \
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= ::boost::graph::detail::no_parameter()
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#else
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#define BOOST_GRAPH_ENABLE_IF_MODELS(Graph, Tag, Type) Type
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#define BOOST_GRAPH_ENABLE_IF_MODELS_PARM(Graph, Tag)
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#endif // no SFINAE support
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#endif // BOOST_GRAPH_OVERLOADING_HPP
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