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1 | .. Metafunctions/Logical Operations//not_ |30 | |
2 | ||
3 | not\_ | |
4 | ===== | |
5 | ||
6 | Synopsis | |
7 | -------- | |
8 | ||
9 | .. parsed-literal:: | |
10 | ||
11 | template< | |
12 | typename F | |
13 | > | |
14 | struct not\_ | |
15 | { | |
16 | typedef |unspecified| type; | |
17 | }; | |
18 | ||
19 | ||
20 | ||
21 | Description | |
22 | ----------- | |
23 | ||
24 | Returns the result of *logical not* (``!``) operation on its argument. | |
25 | ||
26 | ||
27 | Header | |
28 | ------ | |
29 | ||
30 | .. parsed-literal:: | |
31 | ||
32 | #include <boost/mpl/not.hpp> | |
33 | #include <boost/mpl/logical.hpp> | |
34 | ||
35 | ||
36 | Parameters | |
37 | ---------- | |
38 | ||
39 | +---------------+---------------------------+-----------------------------------------------+ | |
40 | | Parameter | Requirement | Description | | |
41 | +===============+===========================+===============================================+ | |
42 | | ``F`` | Nullary |Metafunction| | Operation's argument. | | |
43 | +---------------+---------------------------+-----------------------------------------------+ | |
44 | ||
45 | ||
46 | Expression semantics | |
47 | -------------------- | |
48 | ||
49 | For arbitrary nullary |Metafunction| ``f``: | |
50 | ||
51 | .. parsed-literal:: | |
52 | ||
53 | typedef not_<f>::type r; | |
54 | ||
55 | :Return type: | |
56 | |Integral Constant|. | |
57 | ||
58 | :Semantics: | |
59 | Equivalent to | |
60 | ||
61 | .. parsed-literal:: | |
62 | ||
63 | typedef bool_< (!f::type::value) > r; | |
64 | ||
65 | .. .......................................................................... | |
66 | ||
67 | .. parsed-literal:: | |
68 | ||
69 | typedef not_<f> r; | |
70 | ||
71 | :Return type: | |
72 | |Integral Constant|. | |
73 | ||
74 | :Semantics: | |
75 | Equivalent to | |
76 | ||
77 | .. parsed-literal:: | |
78 | ||
79 | struct r : not_<f>::type {}; | |
80 | ||
81 | ||
82 | Example | |
83 | ------- | |
84 | ||
85 | .. parsed-literal:: | |
86 | ||
87 | BOOST_MPL_ASSERT_NOT(( not_< true\_ > )); | |
88 | BOOST_MPL_ASSERT(( not_< false\_ > )); | |
89 | ||
90 | ||
91 | See also | |
92 | -------- | |
93 | ||
94 | |Metafunctions|, |Logical Operations|, |and_|, |or_| | |
95 | ||
96 | ||
97 |