How to let inline functions from different classes call each other

Question

To make some core-codes run as fast as possible, I want to make three functions inline, those belong to two classes respectively.

Ideally, I want to define them as following:

class ClassB;
class ClassA {
    ClassB * pB;

    inline void func1() {
        // do something
    };

    inline void func2() {
        pB->func3();
    };
};

class ClassB {
    ClassA * pA;

    inline void func3() {
        pA->func1();
    };
};

I know it's impossible if I simplly code as above. My question is : Is there a way in it, we can do similar things? At least, let them run as fast as possible. Thanks!

Answer 1

You can define the functions outside the class definitions and still inline them.

class ClassB;
class ClassA {
   ClassB * pB;

   void func1();

   void func2();
};

class ClassB {
   ClassA * pA;

   void func3();
};

inline void A::func1()
{
   // do something
}

inline void A::func2()
{
   pB->func3();
}

inline void B::func3()
{
   pA->func1();
}

I am not sure how the compiler will generate code for mutually referencing inline functions but they are fine from a synactic point of view.