Re: Accessing ClassA's properties from within ClassB
"Phil Goddard" <PhilGoddard@discussions.microsoft.com> wrote in message
news:FB8B1604-D46E-4E5D-9ED0-692BB627BD65@microsoft.com
I have created (an unattributed) ATL project and have added two
classes, call them classA and classB.
I want to pass a ClassA object into a method of a ClassB object and
use some of the ClassA object's properties inside that ClassB method.
What is the recommended way to do this?
Anything wrong with ClassB::someMethod(classA* pA) ?
If the classB method is
STDMETHODIMP CclassB::myMethodName(IclassA* objA)
So you want a method that takes a pointer to some interface that classA
implements. Of course, the moment you make this method externally
accessible, a client can implement IclassA on their own object and pass
their implementation to myMethodName. You can no longer be sure that an
object behind IclassA pointer is really ClassA. Your method will have to
be able to work purely in terms of methods available on IclassA
interface.
What are you really trying to achieve? Chances are, you can change the
design so that a raw ClassA pointer is passed internally, without
requiring the client to take it from you and then pass it right back to
you.
--
With best wishes,
Igor Tandetnik
With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925