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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 |