Having an instance of a class take on a value?

Question

Chris Gnam 2019-8-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477454-having-an-instance-of-a-class-take-on-a-value

评论： Chris Gnam 2019-8-24

采纳的回答： Steven Lord

在 MATLAB Online 中打开

What I mean by this is I'd like to implement behavior similar to that of the datetime class.

When you create an instance of datetime, the resulting object shows up as:

foo = 
  datetime
   24-Aug-2019 16:30:23
   
   

foo still maintains the fields:

'Format'
'TimeZone'
'Year'
'Month'
'Day'
'Hour'
'Minute'
'Second'
'SystemTimeZone'

But foo itself appears to have a "value" (which shows the day-month-year hour minute seconds values). This behavior is nice since it lets you do things like "foo1 - foo2" where both foo1 and foo2 are datetime objects and the resulting value is also a datetime.

I'm unsure of how to get this same behavior with a custom class of my own creation? I'm trying to implement my own time keeping class for astronomical purposes, so this kind of behavior would be extremely useful. I had originally attempted to use datetime as a superclass, however datetime appears to be sealed and so I cannot inherit from it unfortunately.

Any help would be greatly appreciated!