Struct template is

Struct template is_integral

boost::random::traits::is_integral — Traits class that indicates whether type T is an integer.

Synopsis

// In header: <boost/random/traits.hpp>

template<typename T> 
struct is_integral : public integral_constant< bool, boost::is_integral< T >::value||(std::numeric_limits< T >::is_integer)>
{
};