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Re: Enumset.contains

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On 11/09/2012 10:40 PM, Roedy Green wrote:
> You might think

No.

> EnumSet.contains( subset ) would mean containsAnyOf or containsAllOf
> but it is meaningless.
>
> There is an EnumSet.containsAll but no EnumSet.containsAnyOf
>
> It seems odd Set and EnumSet don't directly support the usual things
> mathematicians do with sets,
> union
> intersection
retainAll()

> isSubsetOf
containsAll()

> isSuperSetOf
containsAll()

> The operations would be so fast internally if Oracle used the binary
> logic ops to handle bit strings, rather than flat-footed processing an
> element at a time.
>
> What think you?

You can use clone() and retainAll() and check return type, or use 
addAll() and check whether size < oldSize + other.size(), or write a 
loop in a few lines...

Cheers

	robert

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Thread

Enumset.contains Roedy Green <see_website@mindprod.com.invalid> - 2012-11-09 13:40 -0800
  Re: Enumset.contains Lew <lewbloch@gmail.com> - 2012-11-09 15:07 -0800
    Re: Enumset.contains Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-11-09 23:50 +0000
  Re: Enumset.contains Robert Klemme <shortcutter@googlemail.com> - 2012-11-10 00:30 +0100
    Re: Enumset.contains Roedy Green <see_website@mindprod.com.invalid> - 2012-11-10 16:56 -0800
      Re: Enumset.contains markspace <-@.> - 2012-11-10 17:10 -0800
      Re: Enumset.contains Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-11-10 20:38 -0600

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