[Issue 20496] New: chunkby should support ref predicates
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Fri Jan 10 04:40:04 UTC 2020
https://issues.dlang.org/show_bug.cgi?id=20496
Issue ID: 20496
Summary: chunkby should support ref predicates
Product: D
Version: D2
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P1
Component: phobos
Assignee: nobody at puremagic.com
Reporter: schveiguy at yahoo.com
auto r = [1,1,1,2,2,2,3,3,3];
writeln(r.chunkBy!((ref e1, ref e2) => e1 == e2));
Error: static assert: "chunkBy expects either a binary predicate or a unary
predicate on range elements of type: int"
The issue is that the test is using ElementType!Range.init as the parameters to
the binary function. A workaround is to use auto ref (as the actual usage will
be with lvalues).
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