Questions of copy constructor

From: away (Gusalpine_at_spambs.com)
Date: 09/14/04 

Date: Tue, 14 Sep 2004 14:16:01 GMT

1. When a class defined with a member of pointer type, it's necessary to
have a copy constructor and assignment operator.

If don't pass objects of such class as value in a function and don't do
assignment, should copy constructor and assignment operator be unnecessary?

2. If a base class have a pointer member, should its derived classes also
need copy constructor and assignment operator, no matter if a derived class
itself has a pointer member or not?

3. If such a pointer member of pointer type of "void", such void type can be
casted to any other type at runtime, how to code a copy constructor for such
a member?

Thanks for help!

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