[Issue 4535] std.range could have a takeWhile!pred(range) function

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=4535

timon.gehr at gmx.ch changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |---

--- Comment #7 from timon.gehr at gmx.ch ---
(In reply to Jonathan M Davis from comment #6)
> (In reply to timon.gehr from comment #5)
> > This enhancement requests is not "INVALID".
> 
> Closing it as "won't fix" would be more appropriate.

Perhaps. There is nothing about the suggestion that is "invalid" though.

> We already have until,
> which does what takeWhile would do - it just has an arguably worse name. Is
> there something about until that does not fulfill what takeWhile would do?

In many (most?) circumstances it is just silly to have to specify a condition
to detect the first element that you do /not/ want included in your range.
There is a reason 'filter' keeps the elements for which the predicate evaluates
to 'true' and not those for which it evaluates to 'false'.

> While I don't think that it existed when this issue was opened, there is now
> an overload for until that does not take a sentinel and AFAIK does exactly
> what takeWhile would do.

I guess one way to use it is to create one's own takeWhile function.

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