Шаблон класса "Двусвязный список

[DIMON007]

Помогите исправить ошибку:
#include<iostream>
using namespace std;
template<class T>
class spisok
{
spisok * last;
spisok * first;
spisok *pred;
spisok *next;
T data;
public:
void add(T);
void del();
void print();
friend ostream& operator <<(ostream&,spisok);
friend bool operator ==(spisok&,spisok&);
};
template<class T>
void spisok<T>::add(T data)
{
spisok *p=new spisok;
if(last==NULL)
p->pred=NULL;
else
{
last->next=p;
p->pred=last;
}
last=p;
p->next=NULL;
p->data=data;
}
template<class T>
void spisok<T>:el()
{
last=last->pred;
last->next=NULL;
}
template<class T>
void spisok<T>:rint()
{
spisok *p=first;
while(p)
{
cout<<p->data<<endl;
p=p->next;
}
cout<<endl;
}
template<class T>
ostream& operator <<(ostream& out,spisok<T> s)
{
spisok *p=s.first;
while(p)
{
out<<p->data<<endl;
p=p->next;
}
out<<endl;
return out;
}
template<class T>
bool operator ==(spisok<T> &A,spisok<T> &B)
{
spisok *a=A.first;
spisok *b=B.first;
int k1=0,k2=0;
while(a)
{
k1++;
a=a->next;
}
while(b)
{
k2++;
b=b->next;
}
if(k1==k2)
return true;
else
return false;

}
void main()
{
int k1,k2;
spisok <int> A;
int di;
spisok <char> B;
char dc;
cout<<"vvedite razmer 1 spiska"<<endl;
cin>>k1;
cout<<"vvedite elementi 1 spiska(int)"<<endl;
for(int i=0;i<k1;i++)
{
cout<<i+1<<" element:";
cin>>di;
A.add(di);
}
cout<<"vvedite razmer 1 spiska"<<endl;
cin>>k2;
cout<<"vvedite elementi 2 spiska(char)"<<endl;
for(int i=0;i<k2;i++)
{
cout<<i+1<<" element:";
cin>>dc;
B.add(dc);
}
A.print();
cout<<A;
}