projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | .. Metafunctions/Arithmetic Operations//negate |60 |
| 2 | ||
| 3 | negate | |
| 4 | ====== | |
| 5 | ||
| 6 | Synopsis | |
| 7 | -------- | |
| 8 | ||
| 9 | .. parsed-literal:: | |
| 10 | ||
| 11 | template< | |
| 12 | typename T | |
| 13 | > | |
| 14 | struct negate | |
| 15 | { | |
| 16 | typedef |unspecified| type; | |
| 17 | }; | |
| 18 | ||
| 19 | ||
| 20 | ||
| 21 | Description | |
| 22 | ----------- | |
| 23 | ||
| 24 | Returns the negative (additive inverse) of its argument. | |
| 25 | ||
| 26 | ||
| 27 | Header | |
| 28 | ------ | |
| 29 | ||
| 30 | .. parsed-literal:: | |
| 31 | ||
| 32 | #include <boost/mpl/negate.hpp> | |
| 33 | #include <boost/mpl/arithmetic.hpp> | |
| 34 | ||
| 35 | ||
| 36 | Model of | |
| 37 | -------- | |
| 38 | ||
| 39 | |Numeric Metafunction| | |
| 40 | ||
| 41 | ||
| 42 | Parameters | |
| 43 | ---------- | |
| 44 | ||
| 45 | +---------------+---------------------------+-----------------------------------------------+ | |
| 46 | | Parameter | Requirement | Description | | |
| 47 | +===============+===========================+===============================================+ | |
| 48 | | ``T`` | |Integral Constant| | Operation's argument. | | |
| 49 | +---------------+---------------------------+-----------------------------------------------+ | |
| 50 | ||
| 51 | |Note:| |numeric metafunction note| |-- end note| | |
| 52 | ||
| 53 | ||
| 54 | Expression semantics | |
| 55 | -------------------- | |
| 56 | ||
| 57 | For any |Integral Constant| ``c``: | |
| 58 | ||
| 59 | .. parsed-literal:: | |
| 60 | ||
| 61 | typedef negate<c>::type r; | |
| 62 | ||
| 63 | :Return type: | |
| 64 | |Integral Constant|. | |
| 65 | ||
| 66 | :Semantics: | |
| 67 | Equivalent to | |
| 68 | ||
| 69 | .. parsed-literal:: | |
| 70 | ||
| 71 | typedef integral_c< c::value_type, ( -c::value ) > r; | |
| 72 | ||
| 73 | .. .......................................................................... | |
| 74 | ||
| 75 | .. parsed-literal:: | |
| 76 | ||
| 77 | typedef negate<c> r; | |
| 78 | ||
| 79 | :Return type: | |
| 80 | |Integral Constant|. | |
| 81 | ||
| 82 | :Semantics: | |
| 83 | Equivalent to | |
| 84 | ||
| 85 | .. parsed-literal:: | |
| 86 | ||
| 87 | struct r : negate<c>::type {}; | |
| 88 | ||
| 89 | ||
| 90 | Complexity | |
| 91 | ---------- | |
| 92 | ||
| 93 | Amortized constant time. | |
| 94 | ||
| 95 | ||
| 96 | Example | |
| 97 | ------- | |
| 98 | ||
| 99 | .. parsed-literal:: | |
| 100 | ||
| 101 | typedef negate< int_<-10> >::type r; | |
| 102 | BOOST_MPL_ASSERT_RELATION( r::value, ==, 10 ); | |
| 103 | BOOST_MPL_ASSERT(( is_same< r::value_type, int > )); | |
| 104 | ||
| 105 | ||
| 106 | See also | |
| 107 | -------- | |
| 108 | ||
| 109 | |Arithmetic Operations|, |Numeric Metafunction|, |numeric_cast|, |plus|, |minus|, |times| | |
| 110 | ||
| 111 | ||
| 112 |