Re: C language extension - Automatically cast

[Florian Weimer via Gcc]

* Sławomir Lach:

> One of items is automatically cast. For example I declared variable called 
> Button of GtkButton and pass it to function requires GtkWidget. Why do not 
> automatically cast to GtkWidget (like in class hierarchy or conversion 
> operator in C++ or some extra constructors)? But .. it's rather conversion 
> operator.
>
> It could looks like:
> __gcc_parent_type GtkWidget __gcc_parent_type_for GtkButton, GtkLabel, 
> GtkTextView
> __gcc_parent_type GtkBin __gcc_parent_type_for GtkWindow, GtkBox
>
> What do you think?

-fplan9-extensions already implements support for something like this.

But for portable code in that style, you should probably use C++
instead.

Thanks,
Florian