Chris@16: //
Chris@16: //=======================================================================
Chris@16: // Author: Philipp Moeller
Chris@16: //
Chris@16: // Copyright 2012, Philipp Moeller
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //=======================================================================
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP
Chris@16: #define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/property_map/property_map.hpp>
Chris@16: #include <boost/type_traits.hpp>
Chris@16: #include <boost/utility/result_of.hpp>
Chris@16: #include <boost/mpl/and.hpp>
Chris@16: #include <boost/mpl/not.hpp>
Chris@16: #include <utility>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: template<typename Func, typename Key, typename Ret = typename boost::result_of<const Func(const Key&)>::type>
Chris@16: class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > {
Chris@16:   public:
Chris@16:   typedef Key key_type;
Chris@16:   typedef Ret reference;
Chris@16:   typedef typename boost::remove_cv<typename boost::remove_reference<Ret>::type>::type value_type;
Chris@16: 
Chris@16:   typedef typename boost::mpl::if_<
Chris@16:                      boost::mpl::and_<
Chris@16:                        boost::is_reference<Ret>,
Chris@16:                        boost::mpl::not_<boost::is_const<Ret> >
Chris@16:                      >,
Chris@16:                      boost::lvalue_property_map_tag,
Chris@16:                      boost::readable_property_map_tag>::type
Chris@16:     category;
Chris@16: 
Chris@16:   function_property_map(Func f = Func()) : f(f) {}
Chris@16: 
Chris@16:   reference operator[](const Key& k) const {
Chris@16:     return f(k);
Chris@16:   }
Chris@16: 
Chris@16:   private:
Chris@16:   Func f;
Chris@16: };
Chris@16: 
Chris@16: template<typename Key, typename Func>
Chris@16: function_property_map<Func, Key>
Chris@16: make_function_property_map(const Func& f) {
Chris@16:   return function_property_map<Func, Key>(f);
Chris@16: }
Chris@16: 
Chris@16: template<typename Key, typename Ret, typename Func>
Chris@16: function_property_map<Func, Key, Ret>
Chris@16: make_function_property_map(const Func& f) {
Chris@16:   return function_property_map<Func, Key, Ret>(f);
Chris@16: }
Chris@16: 
Chris@16: } // boost
Chris@16: 
Chris@16: #endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP */