Pass a member function as argument

Question

I have a Maya plugin and want to get events for timeChanges. However I need to pass a function that I don't want to be static, but this fail at compilation:

void MyClass::initializeCallbacks()
{
    MDGMessage::addTimeChangeCallback((MMessage::MTimeFunction) &timeChanged,this);
}

void MyClass::timeChanged(MTime tim, MyClass* clientData)
{
    <Code>
}

I then get the following compilation errors:

must explicitly qualify name of member function when taking its address
  ...&timeChanged,this);
     ^~~~~~~~~~~~
      MyClass::
error: cannot cast from type 'void (MyClass::*)(MTime,
      MyClass *)' to pointer type 'MMessage::MTimeFunction' (aka 'void
      (*)(MTime &, void *)')

How can I properly pass a pointer of my function ?

Pass a `void(*)(MTime&, void*)`, as the error message says. That's the address of a `'void(MTime&, void*)` function. It can often be a good idea to read the error message. — Cheers and hth. - Alf, Feb 08 '16 at 10:47
I am struggling on the void(*). My function is declared void, should I change the function declaration or change the way I am passing it ? — Laurent Crivello, Feb 08 '16 at 10:53
I saw your duplicate proposal, but the article you point to does a static_cast, and I don't want to be static (gives issues in Maya). — Laurent Crivello, Feb 08 '16 at 10:58
[Required reading](https://isocpp.org/wiki/faq/pointers-to-members#fnptr-vs-memfnptr-types) — n. m. could be an AI, Feb 08 '16 at 11:00
@Cheersandhth.-Alf If the thing wants a helicopter, you need to pass it a helicopter. If you only have a motorcycle, tough luck. You can't use the thing with it. If you need the thing, build a helicopter. Strap a motorcycle to it if you want. — n. m. could be an AI, Feb 08 '16 at 11:08
https://s-media-cache-ak0.pinimg.com/236x/53/59/2d/53592d7f13e8c6a9a5dff90b265017db.jpg — Cheers and hth. - Alf, Feb 08 '16 at 11:17

Pass a member function as argument

0 Answers0