connecting a callback to a boolean value


I'm trying to connect a callback function to a boolean value, ie the callback has to be called each time a variable equals true... It would be really helpful if someone has some code example... I spend a lot of time tring to use add_watch() with giochannel (or Glib::iochannel) from an udp socket of gnet library (if someone manages to do something with it, i'm really interested). So I decided to use : "gboolean gnet_udp_socket_has_packet <> (...)" with gtkmm signal handling ...

Any other solutions are welcome

thank you in advance

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