header files,sub classes

When writing inheritance in c++.Do i need to include the header files of all my sub classes into the base class.The reason i am asking is i have a base class a which has sub classes b,c,d, and e.I want to use sub classes b,c,d, and e as member variables in a separate class f and i included the header file for base class a in f but it doesn't work.

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Originally Posted by sigur47

When writing inheritance in c++.Do i need to include the header files of all my sub classes into the base class.The reason i am asking is i have a base class a which has sub classes b,c,d, and e.I want to use sub classes b,c,d, and e as member variables in a separate class f and i included the header file for base class a in f but it doesn't work.

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Include the headers for b,c,d and e into the declaration file of f. (Don't forget preprocessor guards so something is not included more than once.)
Typically, a base class should not know about its children.(Which would potentially bring a lot a circular dependency problems)