My approach in similar situations is to use a clear intermediate ptr-to-member-function, like this:
void (Activity::*the_correct_method)(Glib::ustring*) = &Activity::callback; some_sigc_signal.connect (... sigc::mem_fun (the_correct_method, anActivity) ...) otoh, I don't use sigc++ that much any more, having veered toward boost::bind and our own thread+realtime version of slots+signals. so, this trick may not work anymore, or may never have been relevant to your precise situation.
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