Re: LSP

On 06/18/2015 08:02 PM, Raoul Duke wrote:
>> Regarding squares and rectangles--doing it the way you stated violates LSP.
>> That there are oodles of OO tutorials that violate LSP with their very first
>> example is depressing, though, and in a way is one of the most damning
>> indictments of OO.  (Or maybe it's just a case of poor naming: real objects
>> gain and lose properties willy-nilly, and our names for the various
>> groupings violate LSP like crazy.
> 
> 
> 
> So LSP I thought was a nice idea, but not something that works out
> well in reality due to the context-sensitive subjective weasel words,
> "without altering any of the desirable properties of that program" :-)
> 

Uh, see the formal definition with is slightly below on the same
Wikipedia page.

And yes, it's very hard to *not* violate that rule. Hence "prefer
composition over inheritance" and such guidelines.

Regards,

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