CList

[mps2]

Is it possible to declare a CList inside of a CList node?

CMyNode{
public:
int key;
CList<int,int> data;
};

CTest{
public:
CList<CMyNode,CMyNode> m_datalist;
};

This gives me a compile error. Does anyone know why?

[lalas]

what is the error message(s)?

[Paul McKenzie]

Originally posted by mps2
Is it possible to declare a CList inside of a CList node?

CMyNode{
public:
int key;
CList<int,int> data;
};

CTest{
public:
CList<CMyNode,CMyNode> m_datalist;
};

This gives me a compile error. Does anyone know why?

This has been discussed many times on CodeGuru. CList has no copy constructor, and the items that can go in the CList must be copyable and assignable.

For example, you will get a compiler error if you do this:

void foo()
{
   CList<int, int> L1;
   CList<int, int> L2 = L1; // error
   CList<int, int> L3;
   L3 = L2;  // error
}

Creating copies and assigning are some of the operations that CList does internally with the type. The program above shows that copying and assinging CList's are illegal.

To get around the problem,

1) Use pointers to CList OR

2) Derive from CList and provide your own copy ctor and assignement operator OR

3) Use std::list<T> instead of CList. std::list is copyable without adding any code.

Regards,

Paul McKenzie

[mps2]

thanks...i used the std::list