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