Provide default hasher types to Vacant and Occupied entries
#389
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For code which may select to use the `std` `HashMap` or the `hashbrown` `HashMap` based on feature or cfg flags, being forced to provide an explicit hash argument to `VacantEntry` or `OccupiedEntry` structs requires jumping through some hoops. Specifically, the `std` `hash_map::*Entry` structs don't take a hasher type argument at all, making the downstream code change the type entirely when switching from `std` to `hashbrown` or back. For simplicity, its nice to have the argument be optional on the `hashbrown` end, which would let the same code compile with either map.
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@bors r+ |
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For code which may select to use the
stdHashMapor thehashbrownHashMapbased on feature or cfg flags, being forced to provide an explicit hash argument toVacantEntryorOccupiedEntrystructs requires jumping through some hoops. Specifically, thestdhash_map::*Entrystructs don't take a hasher type argument at all, making the downstream code change the type entirely when switching fromstdtohashbrownor back.For simplicity, its nice to have the argument be optional on the
hashbrownend, which would let the same code compile with either map.