Method iterator

include/internal/CL/cl.hpp:922–930

* Internal iterator constructor to capture reference * to the vector it iterates over rather than taking * the vector by copy. */

         * the vector by copy.
         */
        iterator (const vector<T,N> &vec, int index) :
            vec_(&vec)
        {            
            if( !vec.empty() ) {
                index_ = index;
            } else {
                index_ = -1;
            }
        }

    public:
        iterator(void) :