<flat_map>: Fix ordering in insertion and access control in construction
#4828
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Per WG21-N4981 [associative.reqmts.general]/68 and /72.
StephanTLavavej
approved these changes
Jul 11, 2024
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Addresses the FIXME in #4778. Fixes #4779.
For insertion, WG21-N4981 [associative.reqmts.general]/68 and /72 are fully specifying the order of results. So
insertwithout hint should insert at the upper bound, and three-way comparison result should be used in hinted insertion to determine whetherlower_boundorupper_boundshould be used.In construction, the
_Otheris cast to references to_Flat_map_baseto retrieve the correct access control.Drive-by: remove occurrences of the
_NODISCARD_FRIENDworkaround, following up #4782.