long_

Synopsis

template<
      long N
    >
struct long_
{
    // unspecified
    // ...
};

Description

An Integral Constant wrapper for long.

Header

#include <boost/mpl/long.hpp>

Model of

Integral Constant

Parameters

Parameter	Requirement	Description
`N`	An integral constant	A value to wrap.

Expression semantics

The semantics of an expression are defined only where they differ from, or are not defined in 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

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 );