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1 | // Boost.TypeErasure library |
2 | // | |
3 | // Copyright 2011 Steven Watanabe | |
4 | // | |
5 | // Distributed under the Boost Software License Version 1.0. (See | |
6 | // accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | // | |
9 | // $Id$ | |
10 | ||
11 | #ifndef BOOST_TYPE_ERASURE_CONCEPT_OF_HPP_INCLUDED | |
12 | #define BOOST_TYPE_ERASURE_CONCEPT_OF_HPP_INCLUDED | |
13 | ||
14 | namespace boost { | |
15 | namespace type_erasure { | |
16 | ||
17 | template<class Concept, class T> | |
18 | class any; | |
19 | ||
20 | template<class Concept, class T> | |
21 | class param; | |
22 | ||
23 | /** | |
24 | * A metafunction returning the concept corresponding | |
25 | * to an @ref any. It will also work for all bases | |
26 | * of @ref any, so it can be applied to the @c Base | |
27 | * parameter of @ref concept_interface. | |
28 | */ | |
29 | template<class T> | |
30 | struct concept_of | |
31 | { | |
32 | #ifdef BOOST_TYPE_ERASURE_DOXYGEN | |
33 | typedef detail::unspecified type; | |
34 | #else | |
35 | typedef typename ::boost::type_erasure::concept_of< | |
36 | typename T::_boost_type_erasure_derived_type | |
37 | >::type type; | |
38 | #endif | |
39 | }; | |
40 | ||
41 | /** INTERNAL ONLY */ | |
42 | template<class Concept, class T> | |
43 | struct concept_of< ::boost::type_erasure::any<Concept, T> > | |
44 | { | |
45 | typedef Concept type; | |
46 | }; | |
47 | ||
48 | /** INTERNAL ONLY */ | |
49 | template<class Concept, class T> | |
50 | struct concept_of< ::boost::type_erasure::param<Concept, T> > | |
51 | { | |
52 | typedef Concept type; | |
53 | }; | |
54 | ||
55 | } | |
56 | } | |
57 | ||
58 | #endif |