How to check whether all bytes in a memory block are zero

Question

I have a block of memory with elements of fixed size, say 100 bytes, put into it one after another, all with the same fixed length, so memory looks like this

&l         


        

Answer 1

What about using long int and binary or operator.

unsigned long long int *start, *current, *end, value = 0;
// set start,end
for(current = start; current!=end; current++) {
value |= *current;
}
bool AllZeros = !value;