I have encountered a problem trying to deal with keys with a specific lifetimes in a HashMap. I have isolated the relevant parts of a HashMap in a simplified MyHashMap in the following code. I don't understand why the compiler has no problem with the get() method but complains when calling get_mut…

You can use kennytm's trick of making Q a trait object. On nightly, you have raw_entry . The documentation mentions this as one of the use cases: This is useful for Hash memoization Using a search key that doesn't work with the Borrow trait Using custom comparison logic without newtype wrappers …

HashMap keys & lifetimes

help

nologik August 27, 2020, 11:59am 4

Yeah, go with String's like alice said to avoid lifetimes. You should exercise @kornel's axiom:

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HashMap keys & lifetimes

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