How do I implement a callback in C++?

Question

I want to implement a class in c++ that has a callback.

So I think I need a method that has 2 arguments:

• the target object. (let\'s say *myObj)
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Answer 1

One trick is to use interfaces instead, that way you don't need specifically to know the class in your 'MyClassWithCallback', if the object passed in implements the interface.

e.g. (pseudo code)

struct myinterface
{
  void doSomething()=0;
};

class Target : public myinterface { ..implement doSomething... };

and

myinterface *targetObj; 
void setCallback(myinterface *myObj){
    targetObj = myObj;
};

doing the callback

targetObj->doSomething();

setting it up:

Target myTarget;
MyClassWithCallback myCaller;
myCaller.setCallback(myTarget);