Added boost header

test/external/boost/msm/mpl_graph/mpl_utils.hpp

@@ -0,0 +1,62 @@
+// Copyright 2008-2010 Gordon Woodhull
+// 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_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED
+#define BOOST_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED
+
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/map.hpp>
+#include <boost/mpl/set.hpp>
+#include <boost/mpl/insert.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/has_key.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/and.hpp>
+
+namespace boost {
+namespace msm {
+namespace mpl_graph {
+namespace mpl_utils {
+    
+// This is a grab bag of little metafunctions I expect already
+// exist under some name I haven't looked for
+
+// I figure there are probably better ways to do all of these things,
+// but for now I'll just write some utilities to isolate my ignorance
+
+template<typename Seq>
+struct as_map :
+    mpl::fold<Seq, 
+              mpl::map<>, 
+              mpl::insert<mpl::_1, mpl::_2> >
+{};
+template<typename Seq>
+struct as_set :
+    mpl::fold<Seq, 
+              mpl::set<>, 
+              mpl::insert<mpl::_1, mpl::_2> >
+{};
+
+template<typename AssocSeq, typename Key, typename Default>
+struct at_or_default :
+    mpl::if_<typename mpl::has_key<AssocSeq, Key>::type,
+             typename mpl::at<AssocSeq, Key>::type,
+             Default>
+{};
+
+template<typename Seq1, typename Seq2>
+struct set_equal :
+    mpl::fold<Seq2,
+              mpl::true_,
+              mpl::and_<mpl::_1, 
+                        mpl::has_key<typename as_set<Seq1>::type, 
+                                     mpl::_2 > > >
+{};
+                                       
+}
+}
+}
+}              
+
+#endif // BOOST_MSM_MPL_GRAPH_MPL_UTILS_HPP_INCLUDED