GLUtils.h

// Get number of elements in an array:
#define NELEM(array)    (sizeof(array) / sizeof(*(array)))
 
// Loop over an array of given size:
#define FOREACH_NELEM(array, nelem, iter) \
    for (__typeof__(*(array)) *iter = (array); \
        iter < (array) + (nelem); \
        iter++)
 
// Loop over an array of known size:
#define FOREACH(array, iter) \
    FOREACH_NELEM(array, NELEM(array), iter)