[Issue 15928] chain(r1, r2, r3, ...) should discard all arguments after the first infinite range

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15928

Iain Buclaw  changed:

   What|Removed |Added

   Priority|P1  |P4

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[Issue 15928] chain(r1, r2, r3, ...) should discard all arguments after the first infinite range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15928

--- Comment #3 from Marc Schütz  ---
Ah... I now remember the restriction that infinite ranges cannot be
bidirectional. I think this was a conscious decision in order to get a simpler
range hierarchy, but there was no fundamental reason to disallow it, right?

This restriction simplifies things for chain(): if any of the individual ranges
are infinite, the resulting chain cannot be bidirectional.

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[Issue 15928] chain(r1, r2, r3, ...) should discard all arguments after the first infinite range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15928

--- Comment #2 from Andrei Alexandrescu  ---
@Marc didn't think of that. But then what do you do when you come back and you
finish the bidir ranges after the infinite one. So then you have a non-empty
range that you can't pop back from anymore. The mind boggles...

I agree about refusal to compile - let it ride!

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[Issue 15928] chain(r1, r2, r3, ...) should discard all arguments after the first infinite range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15928

Marc Schütz  changed:

   What|Removed |Added

 CC||schue...@gmx.net

--- Comment #1 from Marc Schütz  ---
Not sure about refusing compilation - things like this could appear in
otherwise valid generic code...

Anyway, bidi ranges need special treatment - they need to be accessible from
the end up to the last infinite range, too.

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[Issue 15928] chain(r1, r2, r3, ...) should discard all arguments after the first infinite range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15928

Andrei Alexandrescu  changed:

   What|Removed |Added

   Hardware|x86_64  |All
 OS|Linux   |All

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