derived class

[George2]

Hello everyone,


What does the following statement about derived class mean?

http://www.gotw.ca/gotw/059.htm

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Unreasonable Statement #1: "Polymorphism doesn't work in C++ because you can't make an arbitrary class usable in place of a Base& without changing it (to derive from Base)."
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thanks in advance,
George

[laserlight]

This has been answered elsewhere (http://cboard.cprogramming.com/showthread.php?t=100997).