Calling object methods without knowing "this"
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I am (trying) to implement an Event class template which would work like a C# Event. That is, first I declare it:
Event<ClickEventArgs> OnClick;
then I add handlers to it
void MyClickHandler(ClickEventArgs args);
...
OnClick+=MyClickHandler;
the I invoke it
ClickEventArgs args=new ClickEventArgs(x,y);
OnClick(args);
and it calls all the handlers with the specified params
The problem is that I want the event handlers to be non-static object methods. Is there a way to implement this without using crappy solutions like passing the reference to the object with to the event handler and making it static?
Hi Sheeva_
not sure if I fully understand your problem, but you might want to give the boost libraries a try:
Boost.Function is very good at wrapping up functions of various types - they can be incredibly useful when implementing a callback system.
Boost.Signals encapsulates a signals and slots implementation, which can also be used to write an event system (a prototype of my phd project used this library).
I'm sorry if your problem is a little more complicated than this, but couldn't you also use a std::mem_fun (or similar) to form a pointer or reference to a member function?
Hope this helps :)
not sure if I fully understand your problem, but you might want to give the boost libraries a try:
Boost.Function is very good at wrapping up functions of various types - they can be incredibly useful when implementing a callback system.
Boost.Signals encapsulates a signals and slots implementation, which can also be used to write an event system (a prototype of my phd project used this library).
I'm sorry if your problem is a little more complicated than this, but couldn't you also use a std::mem_fun (or similar) to form a pointer or reference to a member function?
Hope this helps :)
The OO-approach presents another alternative. You could create an interface that defines the handler:
Then store the registered objects (non-statically) and call the handlers when necessary. You'd probably have to do some work to make this work with arbitrary event arguments though.
Greetz,
Illco
class IHandler{public: void Handle( ... );}Then store the registered objects (non-statically) and call the handlers when necessary. You'd probably have to do some work to make this work with arbitrary event arguments though.
Greetz,
Illco
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