projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | // |
| 2 | //======================================================================= | |
| 3 | // Author: Philipp Moeller | |
| 4 | // | |
| 5 | // Copyright 2012, Philipp Moeller | |
| 6 | // | |
| 7 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 8 | // accompanying file LICENSE_1_0.txt or copy at | |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 10 | //======================================================================= | |
| 11 | // | |
| 12 | ||
| 13 | #ifndef BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP | |
| 14 | #define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP | |
| 15 | ||
| 16 | #include <boost/config.hpp> | |
| 17 | #include <boost/property_map/property_map.hpp> | |
| 18 | #include <boost/type_traits.hpp> | |
| 19 | #include <boost/utility/result_of.hpp> | |
| 20 | #include <boost/mpl/and.hpp> | |
| 21 | #include <boost/mpl/not.hpp> | |
| 22 | #include <utility> | |
| 23 | ||
| 24 | namespace boost { | |
| 25 | ||
| 26 | template<typename Func, typename Key, typename Ret = typename boost::result_of<const Func(const Key&)>::type> | |
| 27 | class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > { | |
| 28 | public: | |
| 29 | typedef Key key_type; | |
| 30 | typedef Ret reference; | |
| 31 | typedef typename boost::remove_cv<typename boost::remove_reference<Ret>::type>::type value_type; | |
| 32 | ||
| 33 | typedef typename boost::mpl::if_< | |
| 34 | boost::mpl::and_< | |
| 35 | boost::is_reference<Ret>, | |
| 36 | boost::mpl::not_<boost::is_const<Ret> > | |
| 37 | >, | |
| 38 | boost::lvalue_property_map_tag, | |
| 39 | boost::readable_property_map_tag>::type | |
| 40 | category; | |
| 41 | ||
| 42 | function_property_map(Func f = Func()) : f(f) {} | |
| 43 | ||
| 44 | reference operator[](const Key& k) const { | |
| 45 | return f(k); | |
| 46 | } | |
| 47 | ||
| 48 | private: | |
| 49 | Func f; | |
| 50 | }; | |
| 51 | ||
| 52 | template<typename Key, typename Func> | |
| 53 | function_property_map<Func, Key> | |
| 54 | make_function_property_map(const Func& f) { | |
| 55 | return function_property_map<Func, Key>(f); | |
| 56 | } | |
| 57 | ||
| 58 | template<typename Key, typename Ret, typename Func> | |
| 59 | function_property_map<Func, Key, Ret> | |
| 60 | make_function_property_map(const Func& f) { | |
| 61 | return function_property_map<Func, Key, Ret>(f); | |
| 62 | } | |
| 63 | ||
| 64 | } // boost | |
| 65 | ||
| 66 | #endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP */ |