[C++-sig] Re: operator ->, cast operator

[David Abrahams]

"Leonard \"paniq\" Ritter" <paniq at paniq.org> writes:

> i see there are easy methods of exporting operators that deal with 
> values and mathematical operations, but is there any chance of exporting 
> pointer-to operators?
>
> in this particular case i am exporting a custom interface pointer class 
> to python.
>
> in c++ i can use such a smart pointer like this:
>
>    Ptr<View> view(L"µ.Sandoz.View");
>    if (view)
>    {
>        view->Attach(hWnd, true);
>
>        ...
>
> where Ptr<T> exposes its member T _object using
>
>        InterfaceType* operator->()
>        {
>            return _object;
>        }
>
> i'm exposing Ptr<View> as "View" and the View interface as 
> "ViewInterface" to python.
>
> what i'd like to write in python would be something along the lines of
>
>    view = View("µ.Sandoz.View")
>    view.Attach(self.window, true)
>
> can i realize this without much trouble?

Yeah, just export View using Ptr<View> as the HeldType.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com