C++ FNoncopyable Class

C++ 中为了避免被不正确引用，经常会有不允许 copy 的对象，下面是 FNoncopyable 的 Class 模板

/**
 * utility template for a class that should not be copyable.
 * Derive from this class to make your class non-copyable
 */
class FNoncopyable
{
protected:
    // ensure the class cannot be constructed directly
    FNoncopyable() {}
    // the class should not be used polymorphically
    ~FNoncopyable() {}
private:
    FNoncopyable(const FNoncopyable&);
    FNoncopyable& operator=(const FNoncopyable&);
};