projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | .. Data Types/Numeric//char_ |60 |
| 2 | ||
| 3 | char\_ | |
| 4 | ====== | |
| 5 | ||
| 6 | Synopsis | |
| 7 | -------- | |
| 8 | ||
| 9 | .. parsed-literal:: | |
| 10 | ||
| 11 | template< | |
| 12 | char N | |
| 13 | > | |
| 14 | struct char\_ | |
| 15 | { | |
| 16 | // |unspecified| | |
| 17 | // ... | |
| 18 | }; | |
| 19 | ||
| 20 | ||
| 21 | Description | |
| 22 | ----------- | |
| 23 | ||
| 24 | An |Integral Constant| wrapper for ``char``. | |
| 25 | ||
| 26 | ||
| 27 | Header | |
| 28 | ------ | |
| 29 | ||
| 30 | .. parsed-literal:: | |
| 31 | ||
| 32 | #include <boost/mpl/char.hpp> | |
| 33 | ||
| 34 | ||
| 35 | Model of | |
| 36 | -------- | |
| 37 | ||
| 38 | |Integral Constant| | |
| 39 | ||
| 40 | ||
| 41 | Parameters | |
| 42 | ---------- | |
| 43 | ||
| 44 | +---------------+-------------------------------+---------------------------+ | |
| 45 | | Parameter | Requirement | Description | | |
| 46 | +===============+===============================+===========================+ | |
| 47 | | ``N`` | A character constant | A value to wrap. | | |
| 48 | +---------------+-------------------------------+---------------------------+ | |
| 49 | ||
| 50 | Expression semantics | |
| 51 | -------------------- | |
| 52 | ||
| 53 | |Semantics disclaimer...| |Integral Constant|. | |
| 54 | ||
| 55 | For arbitrary character constant ``c``: | |
| 56 | ||
| 57 | +-------------------+-----------------------------------------------------------+ | |
| 58 | | Expression | Semantics | | |
| 59 | +===================+===========================================================+ | |
| 60 | | ``char_<c>`` | An |Integral Constant| ``x`` such that ``x::value == c`` | | |
| 61 | | | and ``x::value_type`` is identical to ``char``. | | |
| 62 | +-------------------+-----------------------------------------------------------+ | |
| 63 | ||
| 64 | ||
| 65 | Example | |
| 66 | ------- | |
| 67 | ||
| 68 | .. parsed-literal:: | |
| 69 | ||
| 70 | typedef char_<'c'> c; | |
| 71 | ||
| 72 | BOOST_MPL_ASSERT(( is_same< c::value_type, char > )); | |
| 73 | BOOST_MPL_ASSERT(( is_same< c::type, c > )); | |
| 74 | BOOST_MPL_ASSERT(( is_same< next< c >::type, char_<'d'> > )); | |
| 75 | BOOST_MPL_ASSERT(( is_same< prior< c >::type, char_<'b'> > )); | |
| 76 | BOOST_MPL_ASSERT_RELATION( (c::value), ==, 'c' ); | |
| 77 | assert( c() == 'c' ); | |
| 78 | ||
| 79 | ||
| 80 | See also | |
| 81 | -------- | |
| 82 | ||
| 83 | |Data Types|, |Integral Constant|, |int_|, |size_t|, |integral_c| | |
| 84 | ||
| 85 | ||
| 86 |