I have worked on this same problem for three days, I can't do anything about it. Please Help!!
This is not a duplicate of a question with a similar name. The name is similar, but the problem is completely different.
May have something to do with External Dependencies is what I am told.
I am posting all of my code, and if I need to post more info please ask!
list_test.cpp This does more, but this is where it messes up.
#include <cctype> // Provides toupper
#include <iostream> // Provides cout and cin
#include <cstdlib> // Provides EXIT_SUCCESS
#include "list.h" // With value_type defined as double
#include "Node.h"
#include "Iterator.h"
using namespace std;
using namespace list_1;
int main( )
{
list<double> test;
}
iterator.h
// Template CLASS PROVIDED: Iterator
#pragma once
#include "Node.h"
namespace list_1
{
template<typename T>
class Iterator
{
public:
Iterator<T> (Node<T> *np);
// precondition: is_item is true
// post condition n points to the next item in the list
void operator++();
// precondition:
// postcondition: returns true if there is a valid item
bool is_item();
// precondition: is_item == true
// postcondition returns data that n is pointing at
T operator* ();
private:
Node<T>* n;
};
template<typename T>
Iterator<T>::Iterator (Node<T> *np)
{
n = np;
}
template<typename T>
void Iterator<T>::operator++()
{
assert(is_item( ) == true);
n = n->next;
}
template<typename T>
bool Iterator<T>::is_item()
{
return (n->data != NULL);
}
template<typename T>
T Iterator<T>::operator* ()
{
assert(is_item( ) == true);
return n->data;
}
}
Node.h
#pragma once
namespace list_1
{
template <typename T>
struct Node
{
T data;
Node<T> *next;
// Constructor
// Postcondition:
Node<T> (T d);
};
template <typename T>
Node<T>::Node(T d)
{
data = d;
next = NULL;
}
}
list.h
#include "Node.h"
#include "Iterator.h"
namespace list_1
{
template <typename T>
class list
{
public:
// CONSTRUCTOR
list();
// postcondition: all nodes in the list are destroyed.
~list();
// MODIFICATION MEMBER FUNCTIONS
//postcondition: entry is added to the front of the list
void insert_front(const T& entry);
//postcondition: entry is added to the back of the list
void add_back(const T& entry);
// postcondition: all nodes with data == entry are removed from the list
void remove_all(const T& entry);
// postcondition: an iterator is created pointing to the head of the list
Iterator<T> begin(void);
// CONSTANT MEMBER FUNCTIONS
// postcondition: the size of the list is returned
int size( ) const;
private:
Node<T>* head;
};
template <typename T>
list<T>::list( )
{
head = NULL;
}
template <typename T>
list<T>::~list()
{
}
template <typename T>
void list<T>::insert_front(const T& entry)
{
// head = new node(entry, head);
}
template <typename T>
void list<T>::add_back(const T& entry)
{
}
template <typename T>
void list<T>::remove_all(const T& entry)
{
}
template <typename T>
Iterator<T> list<T>::begin(void)
{
//Iterator<T> traverse( );
//return traverse;
}
template <typename T>
int list<T>::size( ) const
{
int size = 0;
Node<T> *tempPoint = head;
for (tempPoint = head; tempPoint != NULL; tempPoint = tempPoint->next)
{
size ++;
}
return size;
}
}
Here is the error message:
1>------ Build started: Project: CS2420LinkedList, Configuration: Debug Win32 ------
1>list_test.obj : error LNK2019: unresolved external symbol "public: __thiscall list_1::list<double>::~list<double>(void)" (??1?$list@N@list_1@@QAE@XZ) referenced in function _main
1>list_test.obj : error LNK2019: unresolved external symbol "public: __thiscall list_1::list<double>::list<double>(void)" (??0?$list@N@list_1@@QAE@XZ) referenced in function _main
1>C:\Users\KyleYas\Documents\Visual Studio 2010\Projects\CS2420LinkedList\Debug\CS2420LinkedList.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Thank you for the answers! I found the problem. I had two of the same list.h files in the External Dependencies, so I just deleted it and it compiled. I don't know how it happened, I guess I set up my program incorrectly.