digitalmars.D.bugs - [Issue 10541] New: Failure writing to elements of std.range.zip
- d-bugmail puremagic.com (38/38) Jul 04 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10541
- d-bugmail puremagic.com (7/7) Jul 04 2013 http://d.puremagic.com/issues/show_bug.cgi?id=10541
http://d.puremagic.com/issues/show_bug.cgi?id=10541 Summary: Failure writing to elements of std.range.zip Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P2 Component: Phobos AssignedTo: nobody puremagic.com ReportedBy: joseph.wakeling webdrake.net 2013-07-04 03:09:15 PDT --- According to the documentation, std.range.zip "offers mutation and swapping if all ranges offer it". However, as the attached code sample shows, attempting to write to elements of a zip in a foreach loop consistently fail, even when accessed by ref and when all ranges in the zip are mutable. The sample code shows (i) foreach'ing over a lockstep of a non-mutable range and an array, writing to the array; (ii) foreach'ing over a zip of a non-mutable range and an array; (iii) foreach'ing over a zip of two arrays, writing to the second, with only the elements of the second accessed via ref; (iv) foreach'ing over a zip of two arrays, accessing the elements of both via ref. The foreach over the lockstep results in an array with correctly-written values, but the arrays that should be written to via foreach over zip remain full of nan's. favour of zip, since it makes it impossible to do a blanket replace 's/lockstep/zip/' and have the resulting code work. At a minimum, zip should be corrected to ensure that its elements are mutable in line with the statement made in the docs (i.e., the 3rd and 4th cases in the sample code should result in arrays filled with correct values). Ideally, elements of a zip that come from a mutable range should themselves be mutable even if the other ranges in the zip aren't (i.e. the 2nd case in the sample code should also work). -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jul 04 2013
http://d.puremagic.com/issues/show_bug.cgi?id=10541 2013-07-04 03:09:54 PDT --- Created an attachment (id=1229) Sample code to illustrate the problem. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jul 04 2013