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| Date | Tue, 13 Jan 2015 16:30:53 +1100 |
| Subject | Re: Comparisons and sorting of a numeric class.... |
| From | Chris Angelico <rosuav@gmail.com> |
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On Tue, Jan 13, 2015 at 3:57 PM, Steven D'Aprano <steve@pearwood.info> wrote: > On Tue, 13 Jan 2015 09:35:43 +1100, Chris Angelico wrote: > >> Subclassing bool breaks this invariant, unless you never instantiate the >> subclass, in which case it's completely useless. > > Not necessarily. A class that you never instantiate, but use as an object > itself, is another way of implementing the singleton design pattern. > Obviously all the methods have to be class methods, but it is doable. > > But wacky exceptions like subclasses that aren't instantiated aside, > normally if you subclass something you intend to instantiate it. True, I should have said "probably useless" instead of "completely useless". :) There's always *something* you could do with it. ChrisA
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Re: Comparisons and sorting of a numeric class.... Chris Angelico <rosuav@gmail.com> - 2015-01-13 09:35 +1100
Re: Comparisons and sorting of a numeric class.... Steven D'Aprano <steve@pearwood.info> - 2015-01-13 04:57 +0000
Re: Comparisons and sorting of a numeric class.... Chris Angelico <rosuav@gmail.com> - 2015-01-13 16:30 +1100
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