1 | |
2 | // (C) Copyright Edward Diener 2012,2013 |
3 | // Use, modification and distribution are subject to the Boost Software License, |
4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
5 | // http://www.boost.org/LICENSE_1_0.txt). |
6 | |
7 | #if !defined(BOOST_TTI_HAS_FUNCTION_HPP) |
8 | #define BOOST_TTI_HAS_FUNCTION_HPP |
9 | |
10 | #include <boost/config.hpp> |
11 | #include <boost/function_types/property_tags.hpp> |
12 | #include <boost/mpl/vector.hpp> |
13 | #include <boost/preprocessor/cat.hpp> |
14 | #include <boost/tti/detail/dfunction.hpp> |
15 | #include <boost/tti/gen/has_function_gen.hpp> |
16 | |
17 | /* |
18 | |
19 | The succeeding comments in this file are in doxygen format. |
20 | |
21 | */ |
22 | |
23 | /** \file |
24 | */ |
25 | |
26 | /// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists. |
27 | /** |
28 | |
29 | trait = the name of the metafunction within the tti namespace. |
30 | |
31 | name = the name of the inner member. |
32 | |
33 | generates a metafunction called "trait" where 'trait' is the macro parameter. |
34 | |
35 | template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG> |
36 | struct trait |
37 | { |
38 | static const value = unspecified; |
39 | typedef mpl::bool_<true-or-false> type; |
40 | }; |
41 | |
42 | The metafunction types and return: |
43 | |
44 | BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'. |
45 | |
46 | BOOST_TTI_TP_R = the return type of the function |
47 | |
48 | BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence |
49 | if function parameters are not empty. |
50 | |
51 | BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function |
52 | if the need for a tag exists. |
53 | |
54 | returns = 'value' is true if the 'name' exists, |
55 | with the appropriate static member function type, |
56 | otherwise 'value' is false. |
57 | |
58 | */ |
59 | #define BOOST_TTI_TRAIT_HAS_FUNCTION(trait,name) \ |
60 | BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION(trait,name) \ |
61 | template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS = boost::mpl::vector<>,class BOOST_TTI_TP_TAG = boost::function_types::null_tag> \ |
62 | struct trait \ |
63 | { \ |
64 | typedef typename \ |
65 | BOOST_PP_CAT(trait,_detail_hf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::type type; \ |
66 | BOOST_STATIC_CONSTANT(bool,value=type::value); \ |
67 | }; \ |
68 | /**/ |
69 | |
70 | /// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists. |
71 | /** |
72 | |
73 | name = the name of the inner member. |
74 | |
75 | generates a metafunction called "has_function_name" where 'name' is the macro parameter. |
76 | |
77 | template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG> |
78 | struct trait |
79 | { |
80 | static const value = unspecified; |
81 | typedef mpl::bool_<true-or-false> type; |
82 | }; |
83 | |
84 | The metafunction types and return: |
85 | |
86 | BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'. |
87 | |
88 | BOOST_TTI_TP_R = the return type of the function |
89 | |
90 | BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence |
91 | if function parameters are not empty. |
92 | |
93 | BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function |
94 | if the need for a tag exists. |
95 | |
96 | returns = 'value' is true if the 'name' exists, |
97 | with the appropriate function type, |
98 | otherwise 'value' is false. |
99 | |
100 | */ |
101 | #define BOOST_TTI_HAS_FUNCTION(name) \ |
102 | BOOST_TTI_TRAIT_HAS_FUNCTION \ |
103 | ( \ |
104 | BOOST_TTI_HAS_FUNCTION_GEN(name), \ |
105 | name \ |
106 | ) \ |
107 | /**/ |
108 | |
109 | #endif // BOOST_TTI_HAS_FUNCTION_HPP |
110 | |