Re: [Boost-users] Templated Class as Polymorphic Function Parameter

From: John Femiani (JOHN.FEMIANI_at_[hidden])
Date: 2008-07-08 16:18:36

> > Joshua Perry <josh <at> 6bit.com> writes:
> >> Now that I have the streams, I have a class that communicates with 
> >> the device
> > and I would like to construct or initialize an object of that class 
> > with any one of the streams.  I have yet to figure out how 
> to form the 
> > constructor/function parameter to allow this.
> >>
> >> I've tried something like this, a stream of the base type of my
> >> devices:
> >> void init( stream< device<bidirectional> > str);
> >
> > Something like this?
<snip>
>
> Yes, and thats what I am doing now, but it only gives me 
> access as a std::iostream.  I would really like access to the 
> other functionality of my templated class.
>

Have you considered a base class with  templatized derived classes, like
boost::function? If that is what you are after I think it is called
'type erasure'.