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+//
+//=======================================================================
+// Author: Philipp Moeller
+//
+// Copyright 2012, Philipp Moeller
+//
+// 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_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP
+#define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP
+
+#include <boost/config.hpp>
+#include <boost/property_map/property_map.hpp>
+#include <boost/type_traits.hpp>
+#include <boost/utility/result_of.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/not.hpp>
+#include <utility>
+
+namespace boost {
+
+template<typename Func, typename Key, typename Ret = typename boost::result_of<const Func(const Key&)>::type>
+class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > {
+ public:
+ typedef Key key_type;
+ typedef Ret reference;
+ typedef typename boost::remove_cv<typename boost::remove_reference<Ret>::type>::type value_type;
+
+ typedef typename boost::mpl::if_<
+ boost::mpl::and_<
+ boost::is_reference<Ret>,
+ boost::mpl::not_<boost::is_const<Ret> >
+ >,
+ boost::lvalue_property_map_tag,
+ boost::readable_property_map_tag>::type
+ category;
+
+ function_property_map(Func f = Func()) : f(f) {}
+
+ reference operator[](const Key& k) const {
+ return f(k);
+ }
+
+ private:
+ Func f;
+};
+
+template<typename Key, typename Func>
+function_property_map<Func, Key>
+make_function_property_map(const Func& f) {
+ return function_property_map<Func, Key>(f);
+}
+
+template<typename Key, typename Ret, typename Func>
+function_property_map<Func, Key, Ret>
+make_function_property_map(const Func& f) {
+ return function_property_map<Func, Key, Ret>(f);
+}
+
+} // boost
+
+#endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP */