Struct template is

Struct template is_fundamental

boost::compute::is_fundamental

// In header: <boost/compute/type_traits/is_fundamental.hpp>

template<typename T> 
struct is_fundamental : public false_type {
};

Meta-function returning true if T is a fundamental (i.e. built-in) type.

For example,

is_fundamental<float>::value == true
is_fundamental<std::pair<int, float>>::value == false