sigc++ signals and GSignal

[Roger Leigh <rleigh whinlatter ukfsn org>]

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Hi folks,

This is mainly a sigc++ question, but relates to GSignal, so I hope
it's on topic.

With GSignal, you can connect a handler, or override a virtual
function in the object class.  In addition, you can specify whether
the virtual function is run first or last, and then connect signals
to run before /or/ after the signal if it runs last.

With sigc::signal, I can only run signals in the order they were
connected.  I'd like to mimic GSignal, in that I want to provide a
default implementation which may be overridden, but if overridden, I
might not want the default to run at all.  Is this possible?


Many thanks,
Roger

- -- 
Roger Leigh
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