int main( int argc, char ** argv ) {
    struct S
    {
        int i;
        int b;
        int c;
        long int e;
    };
    cout << sizeof (struct S) << endl; //sizeof is still an operator
    return 0;
}

struct S
    {
        int i; // 4 bytes
        int b; // 4 bytes
        int c; // 4 bytes
        // 4 invisible bytes of padding to get e to an 8 byte boundary
        long int e; // 8 bytes
    };