[Issue 12199] RedBlackTree problematic with non-string predicates

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12199


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

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                 CC|                            |peter.alexander.au at gmail.co
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--- Comment #1 from Peter Alexander <peter.alexander.au at gmail.com> 2014-02-22 10:55:43 PST ---
Yes, the unit tests are quite horrible, but easy to fix.

Unfortunately, this is blocked by Issue 12225 because of this:

auto redBlackTree(bool allowDuplicates, E)(E[] elems...)
auto redBlackTree(alias less, E)(E[] elems...)

Unexpectedly, passing the predicate as a function matches the first overload,
and tries to call the predicate with no arguments to evaluate it as a bool,
instead of just matching to alias!

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