template <typename T>
class Rect
{
public:
Rect(T length, T height);
T calcArea();
T calePerimeter();
public:
T m_length;
T m_height;
};
template <typename T>
Rect<T>::Rect(T length, T height)
template <typename T>
T Rect<T>::calcArea()
template <typename T>
T Rect<T>::calePerimeter()
