Client adaptor - handler

  class handler_clt : public handler {
  protected:
      handler_clt(handler_srv* x) : _bdy(x) { }
      void  set_body(void* x) { _bdy = x; } 
      handler* _body() { 
          if (!_bdy) throw "handler has no body";
          return (handler*) _bdy;
          }
  private:
  void* _bdy;
  };