Various bugfixes / enhancements for `<flat_set>` - #3993

Merged

Stephan T. Lavavej (StephanTLavavej) merged 13 commits into

microsoft:feature/flat_setfrom

achabense:_For_flat_set_v2

Sep 8, 2023

Commits on Aug 26, 2023

1. Add routine guards
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7f30ebf
2. Fix usage of `_Compressed_pair`
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8fd8556
3.1. Implement LWG3884 (`flat_meow(flat_meow&&, al)`)
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31b311e
4. Various cleanups or enhancements for other methods
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b9acf69
5. Merge `_Sort_potentially_sorted`
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59445c2
6.1. Fix `emplace[_hint]` and `insert([hint,]single_val)` functions
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5a66700

Commits on Aug 27, 2023

7. Try to fix and clarify `insert([hint,]auto&&)`
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a63e98c

Commits on Aug 28, 2023

8. Improve ebco test; add noexcept test
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cc83036

Commits on Aug 30, 2023

9. Review feedback
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9be25df