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Linked List with class-type data

osur (18)
Hello friends,
As the title suggests, I am trying to make a simple linked list that has a class data type. An issue arises when I try to create the pointers needed for the list. While I am entirely unsure as to what the error signifies, I believe it occurs when I use the 'new' construct.
Here are the Error Messages:
Untitled1.cpp:(.text$_ZN4nodeC1Ev[_ZN4nodeC1Ev]+0x14): undefined reference to `Contact::Contact()'
[Error] ld returned 1 exit status

Here are my files:

main1.cpp
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  #include "contactlist.h"
#include <fstream>


using namespace std;


int main()
{
	/*ifstream fin;
	fin.open("contactlist.csv");
	if ( fin.fail() )	
	{
		cerr << "Could not open the Contact List."<<endl;		
		exit(1); 
	}		
	else
	{		 		
		 cout<<"Contact List opened sucessfully"<<endl;
	}
*/
	string temp;
	string temp_fname;
	string temp_lname;
	string temp_telephone;
	string temp_email;

	node* n;
	node* t;
	node* h;
	
	int i_string=0;
	int main_comma_counter = 0;
	int firstnode = 0;
	
	while (cin>> temp)
	{
		
		cin>> temp;
		getline(fin,temp);
		while(main_comma_counter < 4)
		{
		//sorting code where temp_fname, etc are given values...
		}
		n = new node; //issue here (node defined in contactlist.h)
		n->c_Record.set(temp_fname, temp_lname, temp_telephone, temp_email);	
		if(firstnode = 0)
		{
			t = n;
			h = n; //doesn't move. this is the first (header) node. 	
			firstnode++;
		}
		else 
		{
			t->next=n; //'next' from first node points to entire 2nd node;
			t=t->next; //t points to same node as n
		}
			
		i_string = 0;
		main_comma_counter = 0;
		temp = "";
		temp_fname = "";
		temp_lname = "";
		temp_telephone = "";
		temp_email = "";
	}


return 0;
}


Here are the .h and its implementation if needed.
I'd figure most of the stuff here is unrelated, but just in case I missed something...

contactlist.h
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#include <string>
#include <iostream>

#ifndef CONTACTLIST_H
#define CONTACTLIST_H
using namespace std;

class Name{
public:
    Name();
	string first;
	string last;
    void set_first( string fname );
    void set_last( string lname);
private:
	string fname;
	string lname;
};

class Contact //also known as a Record on the assignment sheet
{
public:
    Contact ();
    Contact (Name person,string tel_num, string email_addr);
    void set (string fname, string lname, string tel_num, string email_addr);
    Name get_name ();
    string get_tel ();
    string get_email ();
    void set_name  (Name fullname);
    void set_tel   (string tel_num);
    void set_email (string email_addr);
private:
	Name name;
	string telephone;
	string email;
};

struct node
{
	Contact c_Record; 
	node* next;	
};


class ContactList
{
public:
	ContactList();
	~ContactList();
	int display ( ostream& output);
	int insert (Contact record_to_insert); //insert info to contact class
	int insert(ContactList contact_list); //insert contact to contact list
	int remove (Contact record_to_delete);
	int size();
	int save();
	int find(ostream& output, string lname, string fname); //writes all contacts that match given info
	int find(ostream& output, Contact record_to_find); //writes all contacts that match given contact	
	int make_empty();

};


#endif /* CONTACTLIST_H */



contactlist.cpp
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#include "contactlist.h"


//Functions of class Name
void Name::set_first(string fname)
{
	Name::first = fname;	
}

void Name::set_last(string lname)
{
	Name::last = lname;	
}

//End of class Name functions



//Functions of class Contact


void Contact::set(string fname, string lname, string tel_num, string email_addr)
{
	name.first = fname;
	name.set_first(fname);
	name.last = lname;
	name.set_last(lname);
	
	set_tel(tel_num);
	set_email(email_addr);
}

Name Contact::get_name()
{
	return name;
}

string Contact::get_tel()
{
	return telephone;
}

string Contact::get_email()
{
	return email;
}

void Contact::set_name (Name fullname)
{
	name = fullname;
}

void Contact::set_tel(string tel_num)
{
	telephone = tel_num;
}
void Contact::set_email (string email_addr)
{
	email = email_addr;
}
//End of class Contact functions


//Functions of class ContactList
//...
//End of class ContactList functions

Again, from what I gather I assume the 'new' on line 100 is giving me trouble, but I am really unsure.
Any help would be appreciated!

edit:
I figured it also would be a chore to look this over since I didn't give the input file needed, which is just a .csv with one line. Anything I can change to make it easier?
Last edited on
MikeyBoy (5631)
Again, from what I gather I assume the 'new' on line 100 is giving me trouble, but I am really unsure.
Any help would be appreciated!

I don't see a line 100 in any of the files you've posted.

At line 45 of main1.cpp, you have:

n = new node; //issue here (node defined in contactlist.h)

This invokes the default constructor of node. Since you haven't written one, and haven't declared one, and haven't written any other constructor, the compiler will supply a default constructor for you, which just default-initialises each member of node.

Since one of the members of node is a Contact object, this default constructor is attempting to call the default constructor of Contact. At line 24 of contactlist.h, you've declared that you're going to define that default constructor, so the compiler won't supply it for you - but nowhere in the code that you've posted have you actually defined that constructor.

Hence, the linker is telling you that the default constructor of Contact isn't defined.
Last edited on
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