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46 lines
1.5 KiB
46 lines
1.5 KiB
// 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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