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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 */ |