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Sometimes, more than one member function with a particular name may show up
in a subclass–superclass chain. Suppose, for example, that you must
account for the tendency of railroads to pile material above the rims of
gondola cars. Specifically, you must implement a volume member
function for that kind of car, which is different from the volume
member function defined in the box class:
*-------------------*
| box |
| volume function |
| height |
| width |
| length |
*-------------------*
^ ^
| |
| *--------------------*
| |
| |
*-------------------* *-------------------*
| box_car | | gondola_car |
| | | volume function |
*-------------------* *-------------------*