Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
| Front Page / Data Types / Numeric / bool_ |
template<
bool C
>
struct bool_
{
// unspecified
// ...
};
typedef bool_<true> true_;
typedef bool_<false> false_;
A boolean Integral Constant wrapper.
#include <boost/mpl/bool.hpp>
| Parameter | Requirement | Description |
|---|---|---|
| C | A boolean integral constant | A value to wrap. |
The semantics of an expression are defined only where they differ from, or are not defined in 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. |
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 );