Egor Zhdan 6366878308 [cxx-interop] Add CxxSet protocol for std::set ergonomics ...

This adds a protocol to the C++ standard library overlay which will improve the ergonomics of `std::set`, `std::unordered_set` and `std::multiset` when used from Swift code.

As of now, `CxxSet` adds a `contains` function to C++ sets.

C++ stdlib set types are automatically conformed to `CxxSet`: `std::set`, `unordered_set`, `std::multiset`. Custom user types are not conformed to `CxxSet` automatically: while a custom type might have an interface similar to `std::set`, the semantics might differ, and adding a conformance would cause confusion.

2023-01-26 19:35:30 +00:00

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