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Heterogeneous collections of objects in a list.

Greenbean · 2001-10-23T15:13:55

I''ve got a c++ problem here, probably standard stuff to someone who knows, help would be much appreciated. You''ve got a collection of objects, they all derive from a base class - lets say they are employee (baseclass), manager, cashier and floorman. Now you stick all these in a list which accepts employee objects (a cool thing you can do in oo design). Then you want to iterate through the list and call a function "calculatePay()" on all of them. This is a virtual function in the employee class, with a standard default implementation, and of the subclasses also derive their own version of calculatePay(). Now typically if you ask cashier in this case to do the "calculatePay()" function it will perform its local version, but it seems in the list that it performs the base class version only :/ Pretty useless then, perhaps its because the list is declared as a list of employee objects. Now I do have extra tags in there that can help me identify the class at run time (ie each object holds an enumerated variable that says its "employee", "cashier" etc. So perhaps theres a way of looking at object at runtime, asking what its tag is and doing some sorta funky casting ie: if(i->getTag() == CASHIER) (cashier*)i->calculatePay(); //probably syntactically wrong else i->calculatePay(); //which would be the default base class, seemingly regardless if the function is virtual or not :/ i being the current object in the list which we are examining. Any thoughts?

General and Gameplay Programming Programming

Started by Greenbean October 21, 2001 11:31 AM

9 comments, last by Greenbean 22 years, 6 months ago

Shannon Barber

1,684

October 22, 2001 06:15 PM

Make sure the dtor in the GameObject base class is virtual.

Magmai Kai Holmlor
- Not For Rent

Edited by - Magmai Kai Holmlor on October 23, 2001 4:13:55 PM

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Heterogeneous collections of objects in a list.

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