Question

given the following code:

const myStr codesArr[] =  {"AA","BB", "CC"};     

myStr is a class the wraps char*.
I need to loop over all the items in the array but i don’t know the number of items.
I don’t want to define a const value that will represent the size (in this case 3)

Is it safe to use something like:

const int size = sizeof(codesArr) / sizeof(myStr);

what to do?

Answer 1

You can use int size = sizeof(codesArr) / sizeof(myStr); as long as you don’t pass it as parameter to a function, because then the array will decay into a pointer and lose size information.

You can also use a template trick:

template<typename T, int sz>
int size(T(&)[sz])
{
    return sz;
}