[cairo] Bindings and virtual functions

Owen Taylor otaylor at redhat.com
Wed May 25 11:30:11 PDT 2005

On Wed, 2005-05-25 at 16:26 +0100, Adam Lofts wrote:
> Hello,
> I recently filed a bug in mono bugzilla about making cairo drawing
> operations (i.e. functions in Mono.Cairo.Graphics) virtual, see
> http://bugzilla.ximian.com/show_bug.cgi?id=75028. This needs more
> discussion, the main questions being - 
> Which (if any) of the Cairo functions should be marked virtual ?
> Is it useful to be able to really overload the Cairo public api (this
> would require Cairo to use gobject or something similar) ?
> The answers should be added to the bindings section of the manual.

The bindings section of the manual recommends not allowing users
to derive from cairo_t if at all possible. (Because of the potential
problem of disassociation, mostly)

Beyond that, I don't think overriding any of the cairo_t methods 
makes sense. cairo_fill() has an exactly defined meaning. If you
make it do something else in a subclass, then it's no longer 
cairo_fill(). So, call it something else.


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