header files,sub classes

[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.

[manasij7479]

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.

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)