projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | .. Algorithms/Inserters//inserter |
| 2 | ||
| 3 | .. _`inserter_`: | |
| 4 | ||
| 5 | inserter (class) | |
| 6 | ================ | |
| 7 | ||
| 8 | Synopsis | |
| 9 | -------- | |
| 10 | ||
| 11 | .. parsed-literal:: | |
| 12 | ||
| 13 | template< | |
| 14 | typename State | |
| 15 | , typename Operation | |
| 16 | > | |
| 17 | struct inserter | |
| 18 | { | |
| 19 | typedef State state; | |
| 20 | typedef Operation operation; | |
| 21 | }; | |
| 22 | ||
| 23 | ||
| 24 | Description | |
| 25 | ----------- | |
| 26 | ||
| 27 | A general-purpose model of the |Inserter| concept. | |
| 28 | ||
| 29 | ||
| 30 | Header | |
| 31 | ------ | |
| 32 | ||
| 33 | .. parsed-literal:: | |
| 34 | ||
| 35 | #include <boost/mpl/inserter.hpp> | |
| 36 | ||
| 37 | ||
| 38 | Model of | |
| 39 | -------- | |
| 40 | ||
| 41 | |Inserter| | |
| 42 | ||
| 43 | ||
| 44 | Parameters | |
| 45 | ---------- | |
| 46 | ||
| 47 | +---------------+-------------------------------+-----------------------------------+ | |
| 48 | | Parameter | Requirement | Description | | |
| 49 | +===============+===============================+===================================+ | |
| 50 | | ``State`` | Any type | A initial state. | | |
| 51 | +---------------+-------------------------------+-----------------------------------+ | |
| 52 | | ``Operation`` | Binary |Lambda Expression| | An output operation. | | |
| 53 | +---------------+-------------------------------+-----------------------------------+ | |
| 54 | ||
| 55 | Expression semantics | |
| 56 | -------------------- | |
| 57 | ||
| 58 | |Semantics disclaimer...| |Inserter|. | |
| 59 | ||
| 60 | For any binary |Lambda Expression| ``op`` and arbitrary type ``state``: | |
| 61 | ||
| 62 | +---------------------------+-------------------------------------------+ | |
| 63 | | Expression | Semantics | | |
| 64 | +===========================+===========================================+ | |
| 65 | | ``inserter<op,state>`` | An |Inserter|. | | |
| 66 | +---------------------------+-------------------------------------------+ | |
| 67 | ||
| 68 | Complexity | |
| 69 | ---------- | |
| 70 | ||
| 71 | Amortized constant time. | |
| 72 | ||
| 73 | ||
| 74 | Example | |
| 75 | ------- | |
| 76 | ||
| 77 | .. parsed-literal:: | |
| 78 | ||
| 79 | template< typename N > struct is_odd : bool_< ( N::value % 2 ) > {}; | |
| 80 | ||
| 81 | typedef copy< | |
| 82 | range_c<int,0,10> | |
| 83 | , inserter< // a filtering 'push_back' inserter | |
| 84 | vector<> | |
| 85 | , if_< is_odd<_2>, push_back<_1,_2>, _1 > | |
| 86 | > | |
| 87 | >::type odds; | |
| 88 | ||
| 89 | BOOST_MPL_ASSERT(( equal< odds, vector_c<int,1,3,5,7,9>, equal_to<_,_> > )); | |
| 90 | ||
| 91 | ||
| 92 | See also | |
| 93 | -------- | |
| 94 | ||
| 95 | |Algorithms|, |Inserter|, |Reversible Algorithm|, |front_inserter|, |back_inserter| | |
| 96 | ||
| 97 | .. |[inserter]| replace:: `inserter (class)`_ | |
| 98 | ||
| 99 | ||
| 100 |