| // |
| //======================================================================= |
| // 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_TRANSFORM_VALUE_PROPERTY_MAP_HPP |
| #define BOOST_PROPERTY_MAP_TRANSFORM_VALUE_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 PM, typename Ret = typename boost::result_of<const Func(typename property_traits<PM>::reference)>::type> |
| class transform_value_property_map: public put_get_helper<Ret, transform_value_property_map<Func, PM, Ret> > { |
| public: |
| typedef typename property_traits<PM>::key_type 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; |
| |
| transform_value_property_map(Func f, PM pm) : f(f), pm(pm) {} |
| |
| reference operator[](const key_type& k) const { |
| return f(get(pm, k)); |
| } |
| |
| private: |
| Func f; |
| PM pm; |
| }; |
| |
| template<typename PM, typename Func> |
| transform_value_property_map<Func, PM> |
| make_transform_value_property_map(const Func& f, const PM& pm) { |
| return transform_value_property_map<Func, PM>(f, pm); |
| } |
| |
| template<typename Ret, typename PM, typename Func> |
| transform_value_property_map<Func, PM, Ret> |
| make_transform_value_property_map(const Func& f, const PM& pm) { |
| return transform_value_property_map<Func, PM, Ret>(f, pm); |
| } |
| |
| } // boost |
| |
| #endif /* BOOST_PROPERTY_MAP_TRANSFORM_VALUE_PROPERTY_MAP_HPP */ |