Conversely, (stable) Rust does not have the equivalent of SFINAE. Specialization is available in nightly, which is pretty similar. I've seen this come up comparing Abseil Swiss Map and Hashbrown maps. The former will usually do the most efficient thing by default, but the latter requires the subtle RawEntry API to do things like lookup or insert without copying unless I'm actually inserting.
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Conversely, (stable) Rust does not have the equivalent of SFINAE. Specialization is available in nightly, which is pretty similar. I've seen this come up comparing Abseil Swiss Map and Hashbrown maps. The former will usually do the most efficient thing by default, but the latter requires the subtle
RawEntryAPI to do things like lookup or insert without copying unless I'm actually inserting.