null.class

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

/*                                  null

	Null class, typically used to create instances with all dynamic
	attributes.
*/
*! version 1.0.0  30jul2002

version 8

class {
} , inherit(object)

/* -------------------------------------------------------------------------*/
/*
	Usage:  .nameof dyn_dex

	Returns the name of the dynamically declared attribute at index
	dyn_dex.
*/

program define nameof

	_cls nameoflocal .dynamicmv[`1']
	class exit `"`r(name)'"'
end