returning structs

[jmyrrie]

Hi everyone.
First of all, I'm new around c++ so I would apreciate any given help!
I'm creating a linked list:

This is the List.h

class List{

     private:
        typedef struct  node { 
            int data;
            node* next;
        }* nodePtr;   

        nodePtr head; 
        nodePtr iterador;

    public: 
        List();

        void addHead(nodePtr celd);// Here I want to receive a struct node -
        //data type

        struct node* createCeld(int value);

        void printList();


};

#endif // LIST_H 

1. In the function name createCeld, I made a celd named newCeld and I wanted to return that newCeld, but I was not able t return the struct node*

I think that we cannot return a struct, only pointers; if so, how can i return a pointer holding that celd which type is a struct ?

Any idea of what my mistake is?
Thanks!

[Disch]

I think that we cannot return a struct, only pointers

You can return anything*, so it is perfectly legal to return a struct. However, you probably would not want to return a struct here, because it would be difficult/impossible to put that struct into the linked list. It really makes more sense to return a pointer.

Since, by the code you posted, you already appear to be returning a pointer, you'll have to be more specific about the problem before I can offer any more help. I assume your createCeld function is giving you an error.... if so, what is the error? And can you post the body of your createCeld function?



_{* except a C style array}

[jmyrrie]

Thanks for replying !
Again, I'm noob so don't be mean please haha

    nodePtr  List::createCeld(int value) {
    nodePtr celd= new node;
    celd-> data = value;
    celd-> next= NULL;

    return celd;

    }

And, would you explain why would it be difficult/impossible to put that struct into the linked list, please?

[jmyrrie]

When I compile it, is says:
error: 'nodePtr' does not name a type|
||=== Build finished: 1 errors, 0 warnings (0 minutes, 1 seconds) ===|


So it says the error is in this line:

    nodePtr  List::createCeld(int value) {
    nodePtr celd= new node;
    celd-> data = value;
    celd-> next= NULL;

    return celd;

    }

So I dont have any idea of what to do!

[firedraco]

nodePtr is inside the List class so you must use the scope operator to specify it:

List::nodePtr

[jmyrrie]

So it would be like this:

    List ::nodePtr  List::createCeld(int value) {
    nodePtr celd= new node;
    celd-> data = value;
    celd-> next= NULL;

    return celd;

    }

Where List ::nodePtr is the return type that specifies that we will be returning a nodePtr type which is in the List class?

By that, I'm returning a pointer right?
And by this:
void addHead(nodePtr celd)

Am I passing a pointer named celd, right?

Thanks a lot.

[firedraco]

Where List ::nodePtr is the return type that specifies that we will be returning a nodePtr type which is in the List class?

By that, I'm returning a pointer right?

Yes, that is correct.

Am I passing a pointer named celd, right?

Yes.