| .. Data Types/Numeric//long_ |30 |
| |
| long\_ |
| ====== |
| |
| Synopsis |
| -------- |
| |
| .. parsed-literal:: |
| |
| template< |
| long N |
| > |
| struct long\_ |
| { |
| // |unspecified| |
| // ... |
| }; |
| |
| |
| Description |
| ----------- |
| |
| An |Integral Constant| wrapper for ``long``. |
| |
| |
| Header |
| ------ |
| |
| .. parsed-literal:: |
| |
| #include <boost/mpl/long.hpp> |
| |
| |
| Model of |
| -------- |
| |
| |Integral Constant| |
| |
| |
| Parameters |
| ---------- |
| |
| +---------------+-------------------------------+---------------------------+ |
| | Parameter | Requirement | Description | |
| +===============+===============================+===========================+ |
| | ``N`` | An integral constant | A value to wrap. | |
| +---------------+-------------------------------+---------------------------+ |
| |
| Expression semantics |
| -------------------- |
| |
| |Semantics disclaimer...| |Integral Constant|. |
| |
| For arbitrary integral constant ``n``: |
| |
| +-------------------+-----------------------------------------------------------+ |
| | Expression | Semantics | |
| +===================+===========================================================+ |
| | ``long_<c>`` | An |Integral Constant| ``x`` such that ``x::value == c`` | |
| | | and ``x::value_type`` is identical to ``long``. | |
| +-------------------+-----------------------------------------------------------+ |
| |
| |
| Example |
| ------- |
| |
| .. parsed-literal:: |
| |
| typedef long_<8> eight; |
| |
| BOOST_MPL_ASSERT(( is_same< eight::value_type, long > )); |
| BOOST_MPL_ASSERT(( is_same< eight::type, eight > )); |
| BOOST_MPL_ASSERT(( is_same< next< eight >::type, long_<9> > )); |
| BOOST_MPL_ASSERT(( is_same< prior< eight >::type, long_<7> > )); |
| BOOST_MPL_ASSERT_RELATION( (eight::value), ==, 8 ); |
| assert( eight() == 8 ); |
| |
| |
| See also |
| -------- |
| |
| |Data Types|, |Integral Constant|, |int_|, |size_t|, |integral_c| |
| |
| |
| .. copyright:: Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
