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c++boostboost-signals

Is it possible to add some condition to `boost::signal`

Is it possible to add some condition to boost::signal. It may get some Boolean function and when I emit signal it should check if function returns true then emit.

I don't want to check the condition during emitting because it is emitted it many places. I also don't want to check the condition in the slot because it should not know about that condition.

Solution

  • If you need to emit signal from many places this way, I would add a method for it:

    void emitSignal()
{
   if( /* condition */ ) {
       _signal();
   }
}

    then you call emitSignal() instead of emitting signal directly.