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

On Thu, Jan 28, 2010 at 2:22 PM, Igor R 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 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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