[Boost-users] boost::signals block/unblock

Hi all, Maybe a stupid question: I wonder there's a way to connect a slot to signal (which gives a connection), temporarily disconnect this connection, and reconnect it later (like a block function) My problem is that I need to emit a signal to the connected slots given a condition. If a connection satisfies the precondition, it will be notified, otherwise it is temporarily disconnected. Thanks for any help