Various bugfixes / enhancements for `<flat_set>` - #3985

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achabense wants to merge 20 commits into

microsoft:feature/flat_setfrom

achabense:_For_flat_set

Commits on Aug 24, 2023

1. `_Compressed_pair` should try to compress `key_compare`
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254a6f0
2. add routine guards
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72e30c6
3. fix `_Find() const`
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d9818fc
4. fix iterator usage for `_Emplace_hint`
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5. nitpicks
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6. for ease of future review, regroup/reorder non-constructor methods to keep in line with the standard
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7. implement missing `insert(initializer_list)`.
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d179a50
8. `binary_search` works better for `contains`
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9. fix `insert` methods; both `_Insert` (should rename to `_Emplace`) and `_Emplace_hint` should not be constrainted. see comments.
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10. expose `operator=(initializer_list)`
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11. cleanups: simplify `extract`; make comparision(`==`) more obvious; merge `_Sort_potentially_sorted`
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ea92964
12. fix signature for `insert(iter, iter)`; some other nitpicks
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13. implement LWG3884 `(flat_meow(flat_meow&&, al))` (applied in N4958)
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14. fix 10th commit; add test
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e3d41c5

Commits on Aug 25, 2023

Commits on Aug 26, 2023

20. nitpicks
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ce843fa