dmd 1.046 and 2.031 releases
Charles Hixson
charleshixsn at earthlink.net
Wed Jul 8 18:49:28 PDT 2009
Walter Bright wrote:
> grauzone wrote:
>> I oriented this on the syntax of array slices. Which work that way.
>> Not inconsistent at all. It's also consistent with foreach(_; x..y).
>
> It would look consistent, but it would behave very differently. x..y for
> foreach and slices is exclusive of the y, while case x..y is inclusive.
>
> Creating such an inconsistency would sentence programmers to forever
> thinking "which way is it this time".
>
> To avoid such confusion an obviously different syntax is required.
This isn't a matter that's very important to me, as I rarely use case
statements, but the suggestion made elsewhere of allowing restricted
pattern matching of some sort, or concatenated logical tests, is
appealing. Being able to test for (e.g.)
case (< 5 & > j):
would be very appealing. (I read that as case less than 5 and greater
than j.)
OTOH, I'm not at all sure that such a thing could be implemented
efficiently. The places that I've usually found such things were in
languages interpreted at run time.
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