有可能得到一个函数的返回类型不传递参数吗?
Is it possible to get the return type of a function without passing arguments to it?
D {format}:括弧里的字符串被传递给strftime(3)函数,返回值填充到提示符中。如果不传参数,会按照系统默认的当地时间格式来显示。
D {format} : the format is passed to strftime (3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation.
当调用 sign 方法时,如果不传递任何参数的话,生成的就是封外签名。
The enveloping signature is created when the sign method is called without any arguments.
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