|
|
|
|
|
|
|
But now you have to face a problem: How do you call the volume
function from inside a display_capacity function? Ordinarily, you
call the volume function by writing down an expression that
evaluates to a box_car object, then the class-member operator, and
finally the symbol volume and an empty argument list:
box_car object.volume ( )
You call the yet-to-be-defined display_capacity function
the same way:
box_car object.display_capacity ( )
Hence, the class object acts like an argument; however, unlike an ordinary
argument, the class object has no corresponding parameter inside either
display_capacity or volume. How then do you specify that you
want the volume function to work on the same class object that was
handed over to display_capacity?