Cyrcle reference problem...

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MilanB - 22 Jul 2006 21:50 GMT

Hello

I have struct, and class that handle array of previous mentioned structs.
How to declare struct member, that will point to class that it belongs?

struct S
{
//HOW TO ADD MEMBER THAT WILL POINT TO CLASS C ???
}

class C
{
S** items;
}

Thanks
Milan

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Carl Daniel [VC++ MVP] - 22 Jul 2006 22:52 GMT

> Hello
>
[quoted text clipped - 11 lines]
> S** items;
> }

You need to use a "forward declaration":

class C;

struct S
{
C* m_c; // you can use C* or C&, but not just C
};

class C
{
S** items;
};

-cd

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MilanB - 23 Jul 2006 07:00 GMT

Thanks Daniel.
You solved my problem succesfully.

I would like to you ask about situation that I want to have memeber in
struct S, that point to function in class C (not whole class) does it changes
situation? (All other are the same)

struct S
{
//POINTER TO CLASS C MEMBER FUNCTION: IncrementSelectedCount()
};

class C
{
S** items;
private: int selectedCount;
private: void incrementSelectedCount(void)
{
selectedCount++;
}
};

> > Hello
> >
[quoted text clipped - 27 lines]
>
> -cd

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MilanB - 23 Jul 2006 11:07 GMT

OK. I Found it.
For other who maybe need same help here is solution:

class MyClass;    //Forward declaration

//========================================

struct MyStruct
{
private: MyClass *myClass;
private: void (MyClass::*ptrToMemFunction)();
public: void CallFunction()
    {
        //Calling member function from referenced class
        (myClass->*ptrToMemFunction)();
    }

//On costructor pass Class and Function Member pointer
public :MyStruct(MyClass *parMyClass, void (MyClass::*parPtrToMemFunction)())
    {
        MyStruct::myClass = parMyClass;
        MyStruct::ptrToMemFunction = parPtrToMemFunction;
    }

//========================================

class MyClass
{
private:    void memberFunction(void)
    {
        //do something
    }

//Pass references..
private:    void addNew(...) //some function...
    {
.
.
.
        void (MyClass::*ptrToMemberFunction)() = memberFunction;
        MyStruct myStruct = new MyStruct(this, ptrToMemberFunction);
        //Now we have struct that have valid pointer to MyClass::memeberFunction
.
.
    }

};

Regards
Milan

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Cyrcle reference problem...

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