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In Topic: errors with function

Posted 15 Oct 2011
blackcompe, on 15 October 2011 - 11:54 AM, said:
I just told you exactly what you need to do. Rename val to the corresponding field in the Node class.
```
const T& top() { return getHeadPtr()->val; }
```
It should compile without error. It would also be helpful to post your NODE class.
I did not see your post!! sorry

and I did
```
const T& top() { return LINKED_LIST<T>::getHeadPtr()->m_data; }
```
it compiled.

thank you

In Topic: errors with function

Posted 15 Oct 2011

Okay I'll just post what I have.
Here is my LINKED_LIST.h

#ifndef LINKED_LIST_H
#define LINKED_LIST_H
#include "ORDERED_COLLECTION.h"
#include "NODE.h"
template <class T>
class LINKED_LIST: public ORDERED_COLLECTION<T>
{
  public:
    LINKED_LIST(): m_head(NULL),m_tail(NULL) {}
    LINKED_LIST(const LINKED_LIST<T>& cpy):
        m_head(NULL),m_tail(NULL) {*this = cpy;}
    ~LINKED_LIST() { clear(); }
    void insertAtHead(const T& ins);
    void insertAtTail(const T& ins);
    void removeAtHead();
    void removeAtTail();
    bool find(const T& f) const;
    bool removeFirstOccurrence(const T& rem);
    unsigned int removeAllOccurrences(const T& rem);
    void clear();
    LINKED_LIST<T>& operator=(const LINKED_LIST<T>& rhs);
    bool operator== (const LINKED_LIST<T>& rhs) const;
    NODE<T>* getHeadPtr() {return m_head;}
    NODE<T>* getTailPtr() {return m_tail;}
	
  protected:
    NODE<T>* m_head, *m_tail;
};
#include "LINKED_LIST.hpp"

here is my STACK.h

#ifndef STACK_H
#define STACK_H

#include "LINKED_LIST.h"

template <class T>
class STACK : protected LINKED_LIST<T>
{
 public:
   
  const T& top() { LINKED_LIST<T>::getHeadPtr();}
  void push(const T& ins) { LINKED_LIST<T>::insertAtHead(ins); }
  void pop() { LINKED_LIST<T>::removeAtHead();}
  LINKED_LIST<T>& operator=(const LINKED_LIST<T>& rhs); 
  bool operator== (const LINKED_LIST<T>& rhs) const; 

};


#endif

I know for a fact that my push and pop functions are correct. the = and == functions are also correct.
I need my top function to do the same thing as my getHeadPtr function. I need it to not only return m_head but also what m_head is pointing to. I'm still not understanding what I need to do to make this happen.
Sorry I probably wasn't very clear in the first post.

In Topic: errors with function

Posted 15 Oct 2011
sk1v3r, on 15 October 2011 - 11:27 AM, said:
LINKED_LIST<T>::getHeadPtr()
This is a function call. Is it meant to be here?
Why do you then open up curly brackets?
Also, you cannot return two values from a function.

Maybe it would help if you are telling us what you want to do. And what do mean by "this is a function that I wrote from another class"?

Yes I need my top function to do the same thing as my getHeadPtr function that I have in another file.
I just I don't need to open up curly brackets again if I already have the function implemented in another file, right?
this is what that function looks like in LINKED_LIST.h
```
NODE<T>* getHeadPtr() {return m_head;}
```
so should my function in STACK.h just look like this?
```
const T& top() { LINKED_LIST<T>::getHeadPtr();}
```
with this I get no errors and it makes more sense.

In Topic: call a function from one class to use in another inheritance hierarchy

Posted 15 Oct 2011

#ifndef STACK_H
#define STACK_H

#include "LINKED_LIST.h"

template <class T>
class STACK : protected LINKED_LIST<T>
{
 public:
   
  const T& top() { LINKED_LIST<T>::getHeadPtr() {return m_head;}}
  void push(const T& ins) { LINKED_LIST<T>::insertAtHead(ins); }
  void pop() { LINKED_LIST<T>::removeAtHead();}
  LINKED_LIST<T>& operator=(const LINKED_LIST<T>& rhs); 
  bool operator== (const LINKED_LIST<T>& rhs) const; 

};


#endif

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