模板继承问题

我有一个抽象队列，我想把它的成员继承给另一个子类。当我尝试在我的主文件中创建子对象时，我不断得到对"AbstractQueue：：AbstractQueue(("的未定义引用

enter code here
#ifndef ABSTRACT_QUEUE_H
#define ABSTRACT_QUEUE_H
#include <iostream>
template <class Type>
class AbstractQueue
{
protected:
Type *items;
int front;
int back;
int capacity;
int count;
private:
// data goes here
public:
AbstractQueue(int s);
AbstractQueue(void);
~AbstractQueue(void);
bool empty();
int size();
Type frontele(); //throw(exception) {}
Type dequeue(); //throw(exception) {}
void enqueue ( Type e );
};
template <class Type>
AbstractQueue<Type>::AbstractQueue(int s){
items = new Type[s];
front = 0;
back = 0;
capacity = s;
count = 0;
std::cout << "made the abstract queue!" << std::endl;
}
template <class Type>
AbstractQueue<Type>::~AbstractQueue() {
delete[] items;
std::cout << "destructor called" << std::endl;
}
#endif

IncrementalQueue.h

#ifndef _INCREMENTALQUEUE_H
#define _INCREMENTALQUEUE_H
#include "Queue.h"
//#define SIZE = 10
#include <iostream>
template <class Type>
class IncrementalQueue : public AbstractQueue<Type>{
public:
//AbstractQueue(void);
//~AbstractQueue(void);
IncrementalQueue(int s);
bool empty();
int size();
Type frontele(); //throw(exception) {}
Type dequeue(); //throw(exception) {}
void enqueue ( Type e );

//~IncrementalQueue(void);

//AbstractQueue(void);
//AbstractQueue(int size);
//bool empty(void) ;
/*if (count == 0) {
return true;
}
else {
return false;
}*/
//int size(void);
//Type front throw(exception) {}
//Type dequeue(); //throw(exception) {}
//void enqueue ( Type e ) ;
//IncrementalQueue(int size);
};
template <class Type>
IncrementalQueue<Type>::IncrementalQueue(int s){
this->items = new Type[50];
this->front = 0;
this->back = 0;
this->capacity = 50;
this->count = 0;
std::cout << "made the incremental queue!" << std::endl;
}

#endif

主.cpp

#include "Queue.h"
#include "IncrementalQueue.h"
int main(){
IncrementalQueue<int> incqueue(50);

return 0;
}

我对模板有点生疏，所以我已经挣扎了几个小时。 有没有人知道我的代码在哪里会失败？