Re: Help needed on "no match function error"

I am learning template programming now, and I wrote the following code

#include <iostream>
#include "Queue.h"
using namespace std;

template <typename T> class QueueItem
{
public:
    QueueItem(T item):value(item),next(0){}
    T value;
    QueueItem *next;
};

template <typename T> class Queue
{
private:
    QueueItem<T> *head;
    QueueItem<T> *tail;
public:
    Queue():head(0),tail(0){}
    Queue(const Queue &orig):head(0),tail(0)
    {
        for(QueueItem<T> *temp=orig.head;temp;temp=temp->next)
        {
            push(temp->value);
        }

    }
    Queue& operator=(Queue& orig)
    {
        head =0;
        tail =0;
        for(QueueItem<T> *temp=orig.head;temp;temp=temp->next)
        {
            push(temp->value);
        }
        return *this;
    }

    ~Queue()
    {
        while (head)
        {
            cout<<"In~Queue";
            pop();
            }
    }
    void pop();
    void push(T item);
    bool empty(){
        if (head==0)
            return 1;
        return 0;
    }

};

template <typename T> void Queue<T>::push(T item)
{
    if(empty())
    {
        head = new QueueItem<T>(item);
        tail=head;
    }
    else
    {
        QueueItem<T> *temp;
        temp = new QueueItem<T>(item);
        tail->next=temp;
        tail=temp;
    }
}

template <typename T> void Queue<T>::pop()
{
    if(!empty())
    {
        QueueItem<T> *temp;
        temp=head;
        head = head->next;
        cout<< "pop a value of "<<temp->value<<endl;
        delete temp;
    }
    else
    {
        cerr<<"the Queue is empty, so cannot call pop function"<<endl;
    }
}

int main()
{
    Queue<int> orig_queue;
    for(int i=0; i<8; i++)
        orig_queue.push(i);

    Queue<int> copy_queue;
    copy_queue(orig_queue);//this line has compile error

     return 0;
}

and get the compiling error :
no match for call to ?(Queue<int>) (Queue<int>&)? Queue Queue.cc line
103 1214317008414 99

for the line copy_queue(orig_queue): line

Could you please help me out for this problem? Thanks