projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | .. Algorithms/Transformation Algorithms//reverse_remove_if |170 |
| 2 | ||
| 3 | reverse_remove_if | |
| 4 | ================= | |
| 5 | ||
| 6 | Synopsis | |
| 7 | -------- | |
| 8 | ||
| 9 | .. parsed-literal:: | |
| 10 | ||
| 11 | template< | |
| 12 | typename Sequence | |
| 13 | , typename Pred | |
| 14 | , typename In = |unspecified| | |
| 15 | > | |
| 16 | struct reverse_remove_if | |
| 17 | { | |
| 18 | typedef |unspecified| type; | |
| 19 | }; | |
| 20 | ||
| 21 | ||
| 22 | Description | |
| 23 | ----------- | |
| 24 | ||
| 25 | Returns a new sequence that contains all the elements from |begin/end<Sequence>| range | |
| 26 | in reverse order except those that satisfy the predicate ``Pred``. | |
| 27 | ||
| 28 | |transformation algorithm disclaimer| | |
| 29 | ||
| 30 | Header | |
| 31 | ------ | |
| 32 | ||
| 33 | .. parsed-literal:: | |
| 34 | ||
| 35 | #include <boost/mpl/remove_if.hpp> | |
| 36 | ||
| 37 | ||
| 38 | Model of | |
| 39 | -------- | |
| 40 | ||
| 41 | |Reversible Algorithm| | |
| 42 | ||
| 43 | ||
| 44 | Parameters | |
| 45 | ---------- | |
| 46 | ||
| 47 | +---------------+-----------------------------------+-------------------------------+ | |
| 48 | | Parameter | Requirement | Description | | |
| 49 | +===============+===================================+===============================+ | |
| 50 | | ``Sequence`` | |Forward Sequence| | An original sequence. | | |
| 51 | +---------------+-----------------------------------+-------------------------------+ | |
| 52 | | ``Pred`` | Unary |Lambda Expression| | A removal condition. | | |
| 53 | +---------------+-----------------------------------+-------------------------------+ | |
| 54 | | ``In`` | |Inserter| | An inserter. | | |
| 55 | +---------------+-----------------------------------+-------------------------------+ | |
| 56 | ||
| 57 | ||
| 58 | Expression semantics | |
| 59 | -------------------- | |
| 60 | ||
| 61 | |Semantics disclaimer...| |Reversible Algorithm|. | |
| 62 | ||
| 63 | For any |Forward Sequence| ``s``, and an |Inserter| ``in``, and an unary | |
| 64 | |Lambda Expression| ``pred``: | |
| 65 | ||
| 66 | ||
| 67 | .. parsed-literal:: | |
| 68 | ||
| 69 | typedef reverse_remove_if<s,pred,in>::type r; | |
| 70 | ||
| 71 | :Return type: | |
| 72 | A type. | |
| 73 | ||
| 74 | :Semantics: | |
| 75 | Equivalent to | |
| 76 | ||
| 77 | .. parsed-literal:: | |
| 78 | ||
| 79 | typedef lambda<pred>::type p; | |
| 80 | typedef lambda<in::operation>::type op; | |
| 81 | ||
| 82 | typedef reverse_fold< | |
| 83 | s | |
| 84 | , in::state | |
| 85 | , eval_if< | |
| 86 | apply_wrap\ ``1``\<p,_2> | |
| 87 | , identity<_1> | |
| 88 | , apply_wrap\ ``2``\<op,_1,_2> | |
| 89 | > | |
| 90 | >::type r; | |
| 91 | ||
| 92 | ||
| 93 | Complexity | |
| 94 | ---------- | |
| 95 | ||
| 96 | Linear. Performs exactly ``size<s>::value`` applications of ``pred``, and at | |
| 97 | most ``size<s>::value`` insertions. | |
| 98 | ||
| 99 | ||
| 100 | Example | |
| 101 | ------- | |
| 102 | ||
| 103 | .. parsed-literal:: | |
| 104 | ||
| 105 | typedef vector_c<int,1,4,5,2,7,5,3,5>::type numbers; | |
| 106 | typedef reverse_remove_if< numbers, greater<_,int_<4> > >::type result; | |
| 107 | ||
| 108 | BOOST_MPL_ASSERT(( equal< result,vector_c<int,3,2,4,1>,equal_to<_,_> > )); | |
| 109 | ||
| 110 | ||
| 111 | See also | |
| 112 | -------- | |
| 113 | ||
| 114 | |Transformation Algorithms|, |Reversible Algorithm|, |remove_if|, |reverse_remove|, | |
| 115 | |reverse_copy_if|, |replace_if| | |
| 116 | ||
| 117 | ||
| 118 |