Re: [Boost-users] [boost-users][bind, signal] how to

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-07-16 14:43:36

AMDG

Igor R wrote:
> Hello,
>
> I've got the following design: several functors ("Tasks"), when
> executed, "delegate" to a shared Processor object that performs some
> coordination between the tasks. The Processor runs the tasks at some
> stage, and wants to be notified by the task when it's over.
> However, I wouldn't like them to "know" each other. I even wouldn't
> like the Processor making assumptions about exact Task's "connection
> point" signature/name.
> For this purpose I want the Task to pass its "connection point" as a
> generic functor - so that the Processor would execute it to subscribe.
> However, I haven't managed to bind signal::connect. I'd appreciate any
> idea about what's wrong in the following schematic code:
> (In the real code the life-time of the objects is managed by means of
> shared/weak pointers, which are omitted here for the sake of
> simplicity!)
>   

Can't you pass a boost::signal rather than a boost::function
that connects to the signal?

Otherwise, try making a function object (untested):

struct connect {
    typedef void result_type;
    template<class Signal, class F>
    void operator()(Signal& signal, const F& f) { signal.connect(f); }
}
...
boost::bind(connect(), boost::ref(done_), _1)

In Christ,
Steven Watanabe