C++ Threading: Referencing a member of a class instance

[adam3223]

I'm using a custom library to start a thread.
I want the threaded function to be a member of an instance of a class:

class A{
	public:
		void ThreadStart(void *);
};

A* a;

int main(){
	a = new A();
	
	CustomLib::StartAThread(a->ThreadStart,"",0); // Error Here
}

The error is:

error C3867: 'A::ThreadStart': function call missing argument list; use '&A::ThreadStart' to create a pointer to member.

I can work around it using this, but it isn't really the way i want todo it.

class A{
	public:
		void ThreadStart(void *);
};

A* a;

int main(){
	CustomLib::StartAThread(Start,"",0); // References a static function instead.
}

void Start(void *){
	a = new A();
	a->ThreadStart();
}

 

[Lithium UK]

It looks like StartAThread is expecting a 'C' style function pointer, so you can't give it a class member method pointer.

Making ThreadStart a static method of class A would work.

Then do

CustomLib::StartAThread(a::ThreadStart,"",0);

Obviously making the method static has other implications, mainly every instance of the class uses the same instance of method, so it might not make sense for you to do that.

 

[adam3223]

Yeah I thought as much, thanks for maing it clear.

I'll stick with the work around then.