#include <boost/qvm/vec_operations.hpp>
namespace boost
{
namespace qvm
{
//Only enabled if:
// is_vec<R>::value && is_vec<A>::value &&
// vec_traits<R>::dim==vec_traits<A>::dim
template <class R,class A>
R convert_to( A const & a );
}
}
R must be copyable.
As if: R r; assign(r,a); return r;