More bugfixes for `flat_set` - #4034

Merged

Stephan T. Lavavej (StephanTLavavej) merged 9 commits into

microsoft:feature/flat_setfrom

achabense:_Flat_set_2_bugfix

Sep 18, 2023

Commits on Sep 16, 2023

1. add test for 2
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cd6e2d8
2. fix type mismatch for count and erase
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62e4084
3. add test for 4
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850bb75
4. forgot to use comp in _Emplace_hint
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0f2ab80
5. add test for 6
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de52f25
6. fix `erase` and `_Erase`'s constraints
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861b451

Commits on Sep 18, 2023