Question

We can pass an array as a variable in a C/C++ function header, as in

int func(int arr[]) { ... }

I’m wondering: Is it ever possible that something goes inside the [] in a variable that’s passed into the function header, or is it always empty?

Answer 1

For any (non-reference) type T, the function signatures R foo(T t[]) and R foo(T t[123]) (or any other number) are identical to R foo(T * t), and arrays are passed by passing the address of the first element.

Note that T may itself be an array type, such as T = U[10].