问题
To continue another question, lets ask this:
How does Boost implement the signals/slot mechanism?
See: How signal and slots are implemented under the hood? http://www.boost.org/doc/libs/1_40_0/doc/html/signals.html
回答1:
here's an interesting snippet from this gamedev.net thread to get the discussion rolling
Original post by Spoonbender So, bonus question: What causes boost::signals to be that much slower?
It looks like there are a couple of biggies. First, despite the fact that boost::signals isn't threadsafe, it enters and leaves critical sections a couple of times. Secondly, there's this named-slots thingy which seems to result in overly complex data structures which take a long time to iterate over. And then there's a lot of nickel-and-diming from various housekeeping things it does. Finally, the individual calls have much higher overhead because of boost::bind's runtiminess. It's all functionality that I'm sure someone has a need for, but I don't.
来源：https://stackoverflow.com/questions/1413777/how-does-boost-implements-signals-and-slots