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Heterogeneous lookup #72
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Follow P1690R0 i.e. enable heterogeneous lookup when both Hash::is_transparent and KeyEqual::is_transparent exist
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Thanks a lot for this! |
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This PR implements heterogeneous lookup in
robin_hood::unordered_setandrobin_hood::unordered_map.As hinted in #39 this is based on P1690R0 which means it is enabled if both the provided
HashandKeyEqualtypes have anis_transparenttag.I've also added heterogeneous "overloads" for
countandcontainsA unit test is added to check the newly added code and that no conversion happens thanks to the heterogeneous lookup.