Question

I have some 3rd-part code:

class A(){
    public:
        void assingOnClickFunction(void (*function)(); 
};

I cannot change anything in that code.
I want to pass to that A::assingOnClickFunction() my method of class B, void B::someFunction(). I have tried (all inside of the B class!):

a->assingOnClickFunction(this->someFunction);

But I get the error:

function call missing argument list; use ‘&B::someFunction’ to create
a pointer to member

So I have changed it to:

a->assingOnClickFunction(&B::someFunction);

But now there is ofc the error about the different types: (void(*)() and (&B::*)()

I cannot make B::someFunction() static (it uses a lot of non-static B‘s members and methods)!

So, is there an option to pass my B::someFunction() to the A::assingOnClickFunction(), not changing it to static and not changing anything in A class (A is not and cannot be aware of B, B includes A)?

Answer 1

If the member function you want to pass is not static, you cannot do that. The method in A accepts a function pointer to a function with no arguments, and a non-static member function has an implicit this pointer argument.