More enhancements for `<flat_set>` - #4019

Merged

Stephan T. Lavavej (StephanTLavavej) merged 6 commits into

microsoft:feature/flat_setfrom

achabense:_Flat_set_2

Sep 19, 2023

Commits on Sep 19, 2023

1. the container is not necessarily reversible
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2. for private methods, use `static_assert` instead of constraints
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3. nitpicks
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4. apply `_Pass_fn` when passing to algorithm; apply `_DEBUG_LT_PRED` when doing single comparision
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5. replace some `_Keys_equal` with single comparision
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6. optimize `flat_set.count(const key&)` and `flat_set.erase(const key&)`
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