Overload Method Call Summary

• Argument 1 is always an object of the appropriate class, as with any method

• On two objects of the same type, you get the objects in the same order:

        $obj1 - $obj2                  mysubtract($obj1, $obj2);
        $obj2 - $obj1                  mysubtract($obj2, $obj1);

• When operating on an overloaded object and an unoverloaded value, the object is always the first argument:

        $obj1 - $x                     mysubtract($obj1, $x);
        $x    - $obj1                  mysubtract($obj1, $x, 1);

• On two overloaded objects of different types, the left-hand argument determines whose method will be called:

        $obj1 - $OBJX                  mysubtract($obj1, $OBJX);
        $OBJX - $obj1                  Xcombine($OBJX, $obj1);

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Copyright © 2003 M. J. Dominus