Array and Rvalue

Question

$4.2/1 - "An lvalue or rvalue of type “array ofN T” or “array of unknown bound of T” can be converted to an rvalue of type “pointer to T.” The result is a pointer to the first element of the array."

I am not sure how do we get an rvalue of an array type other than during initialization/declaration?

Answer 1

You cannot get an rvalue of array type. Arrays can only be lvalues, and whenever they are used in an lvalue they decay to a pointer to the first element.

int array[10];
int * p = array; // [1]

The expression array in [1] is an lvalue of type int (&)[10] that gets converted to an rvalue of type int *p, that is, the rvalue array of N==10 T==int is converted to an lvalue of type pointer to T==int.

Answer 2

Would this stand a chance to demonstrate Array Rvalue?

int main(){
 int buf[10][10];

 int (*p)[10] = buf;

 int (*p2)[10] = p;      // LValue to Rvalue conversion of Array type 'p'
}