[Issue 11128] New: std.algorithm.reduce one-argument version cannot always be chained using UFCS
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Thu Sep 26 22:53:19 PDT 2013
http://d.puremagic.com/issues/show_bug.cgi?id=11128
Summary: std.algorithm.reduce one-argument version cannot
always be chained using UFCS
Product: D
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: daniel350 at bigpond.com
--- Comment #0 from daniel350 at bigpond.com 2013-09-26 22:53:16 PDT ---
Example:
arr1.reduce!((s, x) => s + (x / 3));
Because the natural seed value is arr1.front, depending on the type, this will
return an incorrect result, so you therefore need to provide a seed, using the
one-argument version of std.algorithm.reduce, this cannot be done.
You are therefore forced to use the standard syntax:
reduce!((s, x) => s + (x / 3))(0, arr1);
Or:
0.reduce!((s, x) => s + (x / 3))(arr1);
This seems counter-intuitive, compared to:
arr1.reduce!((s, x) => s + (x / 3))(0);
This change wouldn't play pretty.
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