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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_DATA_HPP) | |
8 | #define BOOST_TTI_HAS_DATA_HPP | |
9 | ||
10 | #include <boost/config.hpp> | |
11 | #include <boost/preprocessor/cat.hpp> | |
12 | #include <boost/type_traits/remove_const.hpp> | |
13 | #include <boost/tti/gen/has_data_gen.hpp> | |
14 | #include <boost/tti/detail/ddata.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 member data or static member 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_T,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_T = the enclosing type in which to look for our 'name' | |
44 | ||
45 | BOOST_TTI_TP_TYPE = The type of the member data or static member. | |
46 | ||
47 | returns = 'value' is true if the 'name' exists, with the correct data type, | |
48 | otherwise 'value' is false. | |
49 | ||
50 | */ | |
51 | #define BOOST_TTI_TRAIT_HAS_DATA(trait,name) \ | |
52 | BOOST_TTI_DETAIL_TRAIT_HAS_DATA(trait,name) \ | |
53 | template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE> \ | |
54 | struct trait \ | |
55 | { \ | |
56 | typedef typename \ | |
57 | BOOST_PP_CAT(trait,_detail_hd) \ | |
58 | < \ | |
59 | typename boost::remove_const<BOOST_TTI_TP_T>::type, \ | |
60 | BOOST_TTI_TP_TYPE \ | |
61 | >::type type; \ | |
62 | BOOST_STATIC_CONSTANT(bool,value=type::value); \ | |
63 | }; \ | |
64 | /**/ | |
65 | ||
66 | /// Expands to a metafunction which tests whether member data or static member data with a particular name and type exists. | |
67 | /** | |
68 | ||
69 | name = the name of the inner member. | |
70 | ||
71 | generates a metafunction called "has_data_name" where 'name' is the macro parameter. | |
72 | ||
73 | template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE> | |
74 | struct has_data_name | |
75 | { | |
76 | static const value = unspecified; | |
77 | typedef mpl::bool_<true-or-false> type; | |
78 | }; | |
79 | ||
80 | The metafunction types and return: | |
81 | ||
82 | BOOST_TTI_TP_T = the enclosing type in which to look for our 'name' | |
83 | ||
84 | BOOST_TTI_TP_TYPE = The type of the member data or static member. | |
85 | ||
86 | returns = 'value' is true if the 'name' exists, with the correct data type, | |
87 | otherwise 'value' is false. | |
88 | ||
89 | */ | |
90 | #define BOOST_TTI_HAS_DATA(name) \ | |
91 | BOOST_TTI_TRAIT_HAS_DATA \ | |
92 | ( \ | |
93 | BOOST_TTI_HAS_DATA_GEN(name), \ | |
94 | name \ | |
95 | ) \ | |
96 | /**/ | |
97 | ||
98 | #endif // BOOST_TTI_HAS_DATA_HPP |