1 | |
2 | // (C) Copyright Edward Diener 2011,2012,2013 |
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_MEMBER_DATA_HPP) |
8 | #define BOOST_TTI_HAS_MEMBER_DATA_HPP |
9 | |
10 | #include <boost/config.hpp> |
11 | #include <boost/preprocessor/cat.hpp> |
12 | #include <boost/tti/detail/ddeftype.hpp> |
13 | #include <boost/tti/detail/dmem_data.hpp> |
14 | #include <boost/tti/gen/has_member_data_gen.hpp> |
15 | |
16 | /* |
17 | |
18 | The succeeding comments in this file are in doxygen format. |
19 | |
20 | */ |
21 | |
22 | /** \file |
23 | */ |
24 | |
25 | /// Expands to a metafunction which tests whether a member data with a particular name and type exists. |
26 | /** |
27 | |
28 | trait = the name of the metafunction. |
29 | |
30 | name = the name of the inner member to introspect. |
31 | |
32 | generates a metafunction called "trait" where 'trait' is the macro parameter. |
33 | |
34 | template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE> |
35 | struct trait |
36 | { |
37 | static const value = unspecified; |
38 | typedef mpl::bool_<true-or-false> type; |
39 | }; |
40 | |
41 | The metafunction types and return: |
42 | |
43 | BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name' |
44 | OR |
45 | The type of the member data in the form of a pointer |
46 | to member data. |
47 | |
48 | BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first |
49 | parameter is the enclosing type. |
50 | |
51 | returns = 'value' is true if the 'name' exists, with the correct data type, |
52 | otherwise 'value' is false. |
53 | |
54 | */ |
55 | #define BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) \ |
56 | BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_DATA(trait,name) \ |
57 | template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE = BOOST_TTI_NAMESPACE::detail::deftype> \ |
58 | struct trait \ |
59 | { \ |
60 | typedef typename \ |
61 | BOOST_PP_CAT(trait,_detail_hmd) \ |
62 | < \ |
63 | BOOST_TTI_TP_ET, \ |
64 | BOOST_TTI_TP_TYPE \ |
65 | >::type type; \ |
66 | BOOST_STATIC_CONSTANT(bool,value=type::value); \ |
67 | }; \ |
68 | /**/ |
69 | |
70 | /// Expands to a metafunction which tests whether a member data with a particular name and type exists. |
71 | /** |
72 | |
73 | name = the name of the inner member. |
74 | |
75 | generates a metafunction called "has_member_data_name" where 'name' is the macro parameter. |
76 | |
77 | template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE> |
78 | struct has_member_data_name |
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_ET = the enclosing type in which to look for our 'name' |
87 | OR |
88 | The type of the member data in the form of a pointer |
89 | to member data. |
90 | |
91 | BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first |
92 | parameter is the enclosing type. |
93 | |
94 | returns = 'value' is true if the 'name' exists, with the correct data type, |
95 | otherwise 'value' is false. |
96 | |
97 | */ |
98 | #define BOOST_TTI_HAS_MEMBER_DATA(name) \ |
99 | BOOST_TTI_TRAIT_HAS_MEMBER_DATA \ |
100 | ( \ |
101 | BOOST_TTI_HAS_MEMBER_DATA_GEN(name), \ |
102 | name \ |
103 | ) \ |
104 | /**/ |
105 | |
106 | #endif // BOOST_TTI_HAS_MEMBER_DATA_HPP |
107 | |