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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_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 */
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