结构对.cpp不可见

Question

I declared a struct at header file, you can see it below.

private: 
    struct Node{
        Customer data;
        Node *next;
        Node *prev;
    };
Node* find (const int index) const;

And declared a function that returns Node* private.

However when I try to implement the function find at my cpp file, it gives an error saying that " identifier Node is undefined ".

Node* CustomerList::find(const int index){
    //some random code
}

What is the problem, isn't Node supposed to be visible to the .cpp ?

Answer 1

Assuming CustomerList is the class containing Node .

CustomerList::Node* CustomerList::find(const int index){
    //some random code
}

Within a CustomerList method you can just say Node but the return type is different, you still need to qualify with CustomerList::