如何只在堆上创建对象，如何只在栈上创建对象

  class   HeapOnly
  {
  public:
  HeapOnly()   {   cout   <<   "constructor."   <<   endl;   }
  void   destroy   ()   const   {   delete   this;   }
  private:
  ~HeapOnly()   {}
  };

class   OnlyStack
  {
  public:
            OnlyStack(){}
  private:
            void*   operator   new(   size_t   );
  };