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

Struct template vector_size

boost::compute::vector_size

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

template<typename T> 
struct vector_size {
};

Meta-function returning the size (number of components) of a vector type T. For scalar types this function returns 1.

For example,

vector_size<float>::value == 1
vector_size<float4_>::value == 4