TITLE: requiring overridding of methods

(Newsgroups: comp.lang.c++.moderated, 17 Apr 99)

XXX: <spammagnet@ecstaticfuturist.com>

> Is there a way to require derived classes to implement certain functions
> of the base class without making the base class an abstract object?

KANZE: James.Kanze@dresdner-bank.com <James.Kanze@dresdner-bank.com>

No.

XXX:

> If there's no way to have the compiler check, perhaps there's a way to
> check at run type to maker sure it has been implemented? Perhaps the
> clone() function could be implemented to detect if it's being called on a
> specific object type?

KANZE:

It should be doable with rtti.  Something along the lines of:

    if ( typeid( *this ) != typeid( MyClass ) )
        throw FunctionNotOverriddenError() ;