Re: [Boost-users] [boost::function] Is there a way to assign a generic function, regardless number of parameters?

Subject: Re: [Boost-users] [boost::function] Is there a way to assign a generic function, regardless number of parameters?
From: Matheus Araújo Aguiar (matheus.pit_at_[hidden])
Date: 2010-01-29 07:23:24

On Thu, Jan 28, 2010 at 2:22 PM, Igor R <boost.lists_at_[hidden]> wrote:

> > void handler1( );
> > void handler2(unsigned int i1, unsigned int i2, float f, char* c);
> >
> > and pass both handlers to an async function of asio and have no problem.
>
> How can you pass both handlers to an async function of asio?
> Maybe, you can create a "binder" based on these functions, but the
> resulting functor should have the number of arguments required by asio
> concepts.
>
> > /* some code doing stuff ... */
> >           schedule_callback(boost::bind(callback1, parameter1,
> parameter2));
> > /* ... do some more things ... */
> > schedule_callback(boost::bind(&FooClass::method1, FooInstancePointer,
> > param1));
> > /* more code  ... */
> > schedule_callback(boost::bind(callback2, param1));
>
> Actually, the question is: *who* will set parameter1, parameter2 etc?
> If you know the values of these arguments in the place where you call
> schedule_callback, and the callback invoker should not set pass any
> arguments to your handler, then the prototype of your handler should
> be: void(void). Then you can do something like this:
>
> void shedule_callback(function<void(void>);
> void handler1(int, int, std::string);
> //...
> schedule_callback(bind(&handler1, 5, 7, "hello"));
>
> But if the callback inoker should pass some parameters to your
> handler, the handler prototype should reflect this fact.
>

Now i understand it. I was messing up functions with binders.
Thanks for your patience and good will Igor!

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-- 
Matheus Araújo Aguiar
Computer Scientist
matheus.pit_at_[hidden]