[ Note: if a program could assign a pointer of type T** to a pointer of type const T** (that is, if line #1
below were allowed), a program could inadvertently modify a const object (as it is done on line #2). For
example,
int main() {
const char c = ’c’;
char* pc;
const char** pcc = &pc; // #1: not allowed
*pcc = &c;
*pc = ’C’; // #2: modifies a const object
}
―end note ]
