operator overload

[Renato Araujo <renatox@xxxxxxxxx>]

Hi,

How to make the operator overload in gtk?
Ex:

X is a class Y whit 2 operators overload  (GTK_BUTTON  and GTK_LABEL)
if (GTK_BUTTON(x)) return the gtk_button; 
if (GTK_LABEL(x)) return the gtk_label;
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