* equal, the address of \a obj1 and \a obj2 are compared. So this compare function
* returns zero if and only if \a obj1 and \a obj2 point to the same memory area.
*/
* equal, the address of \a obj1 and \a obj2 are compared. So this compare function
* returns zero if and only if \a obj1 and \a obj2 point to the same memory area.
*/