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cxxl$help.HLP

##

    Deriving_a_user_class
     If you derive your own class from the ios class, or from one of
     its derived classes, the ios sub-object must be properly initialized
     during instantiation.  Specifically, you must ensure that the
     streambuf pointer within the ios sub-object is valid. To do this, you
     can specify the ios(streambuf *) constructor as a member initializer
     for your class constructor.  Optionally, you can call the
     ios::init(streambuf *) member function.

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