c++ - boost是如何实现信号和槽的？

Question

继续另一个问题，让我们问这个:

Boost是如何实现signals/slot机制的？

参见: How signal and slots are implemented under the hood? http://www.boost.org/doc/libs/1_40_0/doc/html/signals.html

Answer 1

这里有一段来自 this gamedev.net thread 的有趣片段，可以插入讨论

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.