63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
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// Copyright 2008-2010 Gordon Woodhull
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED
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#define BOOST_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED
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#include <boost/mpl/fold.hpp>
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#include <boost/mpl/map.hpp>
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#include <boost/mpl/set.hpp>
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#include <boost/mpl/insert.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/has_key.hpp>
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/and.hpp>
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namespace boost {
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namespace msm {
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namespace mpl_graph {
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namespace mpl_utils {
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// This is a grab bag of little metafunctions I expect already
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// exist under some name I haven't looked for
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// I figure there are probably better ways to do all of these things,
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// but for now I'll just write some utilities to isolate my ignorance
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template<typename Seq>
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struct as_map :
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mpl::fold<Seq,
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mpl::map<>,
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mpl::insert<mpl::_1, mpl::_2> >
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{};
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template<typename Seq>
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struct as_set :
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mpl::fold<Seq,
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mpl::set<>,
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mpl::insert<mpl::_1, mpl::_2> >
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{};
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template<typename AssocSeq, typename Key, typename Default>
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struct at_or_default :
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mpl::if_<typename mpl::has_key<AssocSeq, Key>::type,
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typename mpl::at<AssocSeq, Key>::type,
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Default>
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{};
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template<typename Seq1, typename Seq2>
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struct set_equal :
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mpl::fold<Seq2,
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mpl::true_,
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mpl::and_<mpl::_1,
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mpl::has_key<typename as_set<Seq1>::type,
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mpl::_2 > > >
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{};
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}
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}
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}
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}
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#endif // BOOST_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED
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