projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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 |