[Issue 12188] std.algorithm.nextPermutation requires random access

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12188

Andrei Alexandrescu <andrei at erdani.com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrei at erdani.com

--- Comment #3 from Andrei Alexandrescu <andrei at erdani.com> ---
It's easy to implement allBefore to return a new range type distinct (e.g.
Voldemort) from R. That range would keep the two ranges as state and would say
it's empty when whole.sameHead(right).

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