projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | .. Metafunctions/Comparisons//greater |30 |
| 2 | ||
| 3 | greater | |
| 4 | ======= | |
| 5 | ||
| 6 | Synopsis | |
| 7 | -------- | |
| 8 | ||
| 9 | .. parsed-literal:: | |
| 10 | ||
| 11 | template< | |
| 12 | typename T1 | |
| 13 | , typename T2 | |
| 14 | > | |
| 15 | struct greater | |
| 16 | { | |
| 17 | typedef |unspecified| type; | |
| 18 | }; | |
| 19 | ||
| 20 | ||
| 21 | ||
| 22 | Description | |
| 23 | ----------- | |
| 24 | ||
| 25 | Returns a true-valued |Integral Constant| if ``T1`` is greater than ``T2``. | |
| 26 | ||
| 27 | ||
| 28 | Header | |
| 29 | ------ | |
| 30 | ||
| 31 | .. parsed-literal:: | |
| 32 | ||
| 33 | #include <boost/mpl/greater.hpp> | |
| 34 | #include <boost/mpl/comparison.hpp> | |
| 35 | ||
| 36 | ||
| 37 | Model of | |
| 38 | -------- | |
| 39 | ||
| 40 | |Numeric Metafunction| | |
| 41 | ||
| 42 | ||
| 43 | Parameters | |
| 44 | ---------- | |
| 45 | ||
| 46 | +---------------+---------------------------+-----------------------------------------------+ | |
| 47 | | Parameter | Requirement | Description | | |
| 48 | +===============+===========================+===============================================+ | |
| 49 | | ``T1``, ``T2``| |Integral Constant| | Operation's arguments. | | |
| 50 | +---------------+---------------------------+-----------------------------------------------+ | |
| 51 | ||
| 52 | |Note:| |numeric metafunction note| |-- end note| | |
| 53 | ||
| 54 | ||
| 55 | Expression semantics | |
| 56 | -------------------- | |
| 57 | ||
| 58 | ||
| 59 | For any |Integral Constant|\ s ``c1`` and ``c2``: | |
| 60 | ||
| 61 | .. parsed-literal:: | |
| 62 | ||
| 63 | typedef greater<c1,c2>::type r; | |
| 64 | ||
| 65 | :Return type: | |
| 66 | |Integral Constant|. | |
| 67 | ||
| 68 | :Semantics: | |
| 69 | Equivalent to | |
| 70 | ||
| 71 | .. parsed-literal:: | |
| 72 | ||
| 73 | typedef bool_< (c1::value < c2::value) > r; | |
| 74 | ||
| 75 | ||
| 76 | .. .......................................................................... | |
| 77 | ||
| 78 | .. parsed-literal:: | |
| 79 | ||
| 80 | typedef greater<c1,c2> r; | |
| 81 | ||
| 82 | :Return type: | |
| 83 | |Integral Constant|. | |
| 84 | ||
| 85 | :Semantics: | |
| 86 | Equivalent to | |
| 87 | ||
| 88 | .. parsed-literal:: | |
| 89 | ||
| 90 | struct r : greater<c1,c2>::type {}; | |
| 91 | ||
| 92 | ||
| 93 | ||
| 94 | Complexity | |
| 95 | ---------- | |
| 96 | ||
| 97 | Amortized constant time. | |
| 98 | ||
| 99 | ||
| 100 | Example | |
| 101 | ------- | |
| 102 | ||
| 103 | .. parsed-literal:: | |
| 104 | ||
| 105 | BOOST_MPL_ASSERT(( greater< int_<10>, int_<0> > )); | |
| 106 | BOOST_MPL_ASSERT_NOT(( greater< long_<0>, int_<10> > )); | |
| 107 | BOOST_MPL_ASSERT_NOT(( greater< long_<10>, int_<10> > )); | |
| 108 | ||
| 109 | ||
| 110 | See also | |
| 111 | -------- | |
| 112 | ||
| 113 | |Comparisons|, |Numeric Metafunction|, |numeric_cast|, |greater_equal|, |less|, |equal_to| | |
| 114 | ||
| 115 | ||
| 116 |