Print Function - Linked-List c++

Question

I am trying to figure out what I am doing wrong with this printList Function. I am getting the following compiler error:

No operator "<<" matches these operands.

The function is as follows:

void printList(const List& theList)
{   
for(Node* i = theList.getFirst(); i != theList.getLast(); ++i)
{
    cout << *i << " ";
    cout << endl;
}
}

I have the following as well,

#include "List.h"
#include <iostream>

I am thinking my print function is just way off base. Can anyone point me in the right direction?

Here are my classes, I don't have a List::Iterator. What would you suggest?

class List
{
private:
    int nodeListTotal;
    Node* first;
    Node* last;

public:
    //Constructor
    List();

    void push_back(Node*);
    void push_front(Node*);
    Node* pop_back();
    Node* pop_front();
    Node* getFirst() const;
    Node* getLast() const;
    int getListLength() const;
    void retrieve(int index, int& dataItem) const;
};

class Node
{
private:
    string dataItem;
    string dataUnit;
    int unitTotal;
    Node* next;

public:
    //Constructor
    Node();

    Node(int, string, string);

    string getDescription( );
    void setDescription(string);

    string getQuantityName();
    void setQuantityName(string);

    int getQuantityNumber();
    void setQuantityNumber(int);

    Node* getNext( );
    void setNext(Node*);
};

Try something simpler: Node n; cout << n;. If that doesn't work, then you forgot to define ostream &Node::operator<<(ostream &). — Beta
– Beta, Commented Aug 5, 2013 at 3:58

billz · Accepted Answer · 2013-08-05 04:26:27Z

1

You need to overload operator<< for Node type:

std::ostream& operator<<(std:::ostream& os, const Node& node)
{
    os << node.getQuantityName() << " " << node.getDescription();
    return os;
}

edited Aug 5, 2013 at 4:26

answered Aug 5, 2013 at 4:00

billz

45.6k9 gold badges87 silver badges103 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

KQball Over a year ago

I have updated the question with my classes I don't have List::Iterator.

billz · Accepted Answer · 2013-08-05 04:23:00Z

0

As the error message says

No operator "<<" matches these operands.

you don't have the << operator defined for your class.

edited Aug 5, 2013 at 4:23

billz

45.6k9 gold badges87 silver badges103 bronze badges

answered Aug 5, 2013 at 4:00

ubi

4,4794 gold badges41 silver badges55 bronze badges

Comments

Shubham · Accepted Answer · 2013-08-05 08:09:52Z

0

In your printList() function, replace cout << *i << " "; with
cout << i->getDescription() << endl;

answered Aug 5, 2013 at 8:09

Shubham

9751 gold badge7 silver badges26 bronze badges

Collectives™ on Stack Overflow

Print Function - Linked-List c++

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related