find_fn vs. update_fn

[Jiboxiake]

Hello, I am trying to find out the most performant hashmap for my project and I came across yours. I have a small question. I find two functions, one is find_fn and the other is update_fn. I believe the designers want only update_fn to have a function able to modify the entry's contents. However, I'm wondering if my entry stores std::atomic objects. Are updates to those entries allowed in find_fn? Because I feel it will be more performant. �Thanks.

[manugoyal]

Hi @Jiboxiake. find_fn and update_fn are essentially the same thing, except that find_fn is a const method, so only it can be invoked on a const hashtable. Performance-wise, they should be equivalent.

[Jiboxiake]

Hello, but I thought find_fn is a read access and update_fn is a write access? Thanks.