[Issue 10460] std.algorithm: some of algorithms don't use 'auto ref' for front

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=10460

Peter Alexander <peter.alexander.au at gmail.com> changed:

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--- Comment #1 from Peter Alexander <peter.alexander.au at gmail.com> ---
SetIntersection and SetUnion may be confusing to return auto ref since they
contain overlap, e.g.

int[] a = [1, 2, 3];
int[] b = [2, 3, 4];
foreach (ref e; setIntersection(a, b))
    e = 0;

Does this change the elements of 'a' or 'b'?

For the difference ones, it makes sense because the element is only in one of
the sets.

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