Re: [Boost-users] How to block a signal

From: Johan Råde (rade_at_[hidden])
Date: 2007-02-14 10:19:07

Timmo Stange wrote:
> Dahman wrote:
>> Hi,
>> I have a signal with many slots connected to it and I have a class object witch
>> want to have the possibility to block this signal at the start and unblock it
>> later, but know nothing about what and how many slots are connected to it (then
>> can't use connection.disconnect()).
>>
>> Is there any solution for this problem?
> 
> The easiest solution would be to use two signals:
> 
> signal0<void> initiator;   // the signal that is emitted
> signal0<void> broadcaster; // the signal that observers connect to
> 
> signals::connection control = initiator.connect(broadcaster);
> 
> // ... connect arbitrary number of slots to the broadcaster
> 
> control.block();
> initiator();		// will not call any slots
> control.unblock();
> initiator();		// will call the slots
> 
> Regards
> 
> Timmo Stange

And you could encapsulate this as a class, blockable_signal.

--Johan