On Tue, Mar 5, 2013 at 8:15 AM, David Bruant <[email protected]> wrote:
> I agree on the need but forsee problems with parametrized equivalence > operator [1][2] like "which comparator should be used for the union of 2 > sets with different comparators?" > I vote TypeError. If I really do intend to mix two incompatible Sets, I can go ahead and write it longhand, which is what, 3 lines? 2 with set.addAll(iterable). The need for set intersection/union/minus/etc. feels more important than > the need to parametrized the comparator. > Not sure why this distinction matters, but I feel the opposite. You can very easily and naturally write intersection/union/minus/etc. based on the primitives already in the spec. Not so with custom equivalence! And keys that are pairs or small records are a very common need. Intersection et al are easier but much less important. -j
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