Open
Description
Could we make the grouping operations generic so they're able to produce collections other than std::collections::HashMap
?
I'm proposing turning
fn into_group_map<K, V>(self) -> HashMap<K, Vec<V>>
into
fn into_group_map<K, V, C>(self) -> C where C: FromIterator<(K, Vec<V>)>
And similarly with into_grouping_map()
and that family of types.
My use case is to directly produce HashMaps from the hashbrown crate and not std, but this should enable different applications as well.
Since the HashMap itself is a key component of how the grouping is achieved, it's probably insufficient to use FromIterator
(we don't want to allocate an intermediate collection). I want to start a conversation and see what others think.