| .. Data Types/Numeric//bool_ |10 |
| |
| bool\_ |
| ====== |
| |
| Synopsis |
| -------- |
| |
| .. parsed-literal:: |
| |
| template< |
| bool C |
| > |
| struct bool\_ |
| { |
| // |unspecified| |
| // ... |
| }; |
| |
| typedef bool_<true> true\_; |
| typedef bool_<false> false\_; |
| |
| |
| Description |
| ----------- |
| |
| A boolean |Integral Constant| wrapper. |
| |
| |
| Header |
| ------ |
| |
| .. parsed-literal:: |
| |
| #include <boost/mpl/bool.hpp> |
| |
| |
| Model of |
| -------- |
| |
| |Integral Constant| |
| |
| |
| Parameters |
| ---------- |
| |
| +---------------+-------------------------------+---------------------------+ |
| | Parameter | Requirement | Description | |
| +===============+===============================+===========================+ |
| | ``C`` | A boolean integral constant | A value to wrap. | |
| +---------------+-------------------------------+---------------------------+ |
| |
| Expression semantics |
| -------------------- |
| |
| |Semantics disclaimer...| |Integral Constant|. |
| |
| For arbitrary integral constant ``c``: |
| |
| +-------------------+-----------------------------------------------------------+ |
| | Expression | Semantics | |
| +===================+===========================================================+ |
| | ``bool_<c>`` | An |Integral Constant| ``x`` such that ``x::value == c`` | |
| | | and ``x::value_type`` is identical to ``bool``. | |
| +-------------------+-----------------------------------------------------------+ |
| |
| |
| Example |
| ------- |
| |
| .. parsed-literal:: |
| |
| BOOST_MPL_ASSERT(( is_same< bool_<true>::value_type, bool > )); |
| BOOST_MPL_ASSERT(( is_same< bool_<true>, true\_ > )); } |
| BOOST_MPL_ASSERT(( is_same< bool_<true>::type, bool_<true> > )); |
| BOOST_MPL_ASSERT_RELATION( bool_<true>::value, ==, true ); |
| assert( bool_<true>() == true ); |
| |
| |
| See also |
| -------- |
| |
| |Data Types|, |Integral Constant|, |int_|, |long_|, |integral_c| |
| |
| |
| .. |true_| replace:: `true_`_ |
| .. _`true_`: `bool_`_ |
| |
| .. |false_| replace:: `false_`_ |
| .. _`false_`: `bool_`_ |
| |
| |
| .. 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) |