Need help with an error in my linked list class
Edit: I fixed my initial problem, but now I am getting this linker error that I can't figure out:
Hi guys, I'm trying to make a template linked list class, but I keep getting this error when I try to run the linked list class:
Code:
error LNK2005: "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl
operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class Term const
&)" (??6@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV01@ABVTerm@@@Z) already defined in poly.obj
1>C: ....... : fatal error LNK1169: one or more multiply defined symbols found
Code:
#include <iostream>
using namespace std;
#ifndef LISTP_H
#define LISTP_H
template<typename T>
class List
{
friend ostream &operator<< <T>(ostream &, const List<T> &);
.
.
.
};
// Further down in the file
template< typename T>
ostream &operator<<(ostream &out, const List<T> &aList)
{
T temp;
for (i = 1; i <= size; i++)
{
aList.retrieve(i, temp);
out << temp;
}
return out;
}
//In another class file
#include "llist.h"
class Term
{
friend ostream &operator<<(ostream &, const Term&);
.
.
.
};
ostream &operator<<(ostream & out, const Term& data)
{
if (data.exponent == 0)
out << data.coefficient << endl;
else
out << data.coefficient << "x" << data.exponent << " + ";
return out;
}
//Finally, main
#include <iostream>
#include "poly.h"
using namespace std;
int main()
{
List<Term> ll;
Term x(5, 11), y(12, 5), z(8, 0);
if (x == 11)
cout << x << y << z << endl;
ll.insert(1, x);
return 0;
}
It seems that the error is occurring because I defined two different operator << functions, but I tried commenting one out and that didn't help, so I can't figure out how to fix this one. Can anyone help me out?
