It's so you can do exactly what's being done here - see if you have reached the end of the array by comparing the current position pointer. Lots of iterator de

It's so you can do exactly what's being done here - see if you have reached the end of the array by comparing the current position pointer. Lots of iterator designs have a special "end" iterator you can compare against but not deference or access - this is just the same for C arrays. The C standard here allows pointers to elements one past the array, but it's still busted if you try to dereference it.