请问类模板的类对象声明的异常

请教类模板的类对象声明的错误！
错误提示缺少参数列表，但是，我试着怎么加都没用，请教这个语法错误怎么改！

C/C++ code

template<typename Object>class ObjectPool{public:     ObjectPool(size_t unSize) : m_unSize(unSize)    {        for (size_t unIdx = 0; unIdx < m_unSize; ++ unIdx)        {            m_oPool.push_back(new Object());        }    }private:     size_t m_unSize;     std::list<Object *> m_oPool;}void main(){    ObjectPool  op;//ERROR： 缺少ObjectPool类模板的参数列表}

C/C++ code

template<typename Object>class ObjectPool{public:    ObjectPool(size_t unSize) : m_unSize(unSize)    {        for (size_t unIdx = 0; unIdx < m_unSize; ++ unIdx)        {            m_oPool.push_back(new Object());        }    }private:    size_t m_unSize;    std::list<Object *> m_oPool;};void main(){    ObjectPool<int>  op(2);//ERROR： 缺少ObjectPool类模板的参数列表}