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I'm surprised that no one thus far has mentioned that message passing is just a special case of multiple dispatch. In that light, it seems less expressive. Any

• chris_mahan 14y ago
  Message passing allows you to code the individual components in multiple languages on multiple platforms that run at multiple speeds. The thing that makes it work, however, is that the sender also has a queue, and work-completed messages go into his in-queue, in the order completed, so there is no need of mechanism to collect the results of multiple dispatches, nor is there a need to pass along with the message what function needs to be called on message completion, since the caller queue handler will do that.