Expand description
Halfbrown is a hashmap implementation that provides high performance for both small and large maps by dymaically switching between different backend.
The basic idea is that hash maps are expensive to insert and lookup for small numbers of entries but effective for larger numbers.
So for smaller maps, we picked 32 entries as a rule of thumb, we simply store data in a list of tuples. Looking those up and iterating over them is still faster then hasing strings on every lookup.
Once we pass the 32 entires we transition the
backend to a HashMap.
Note: Most of the documentation is taken from rusts hashmap.rs and should be considered under their copyright.
Macros
Create a
HashMap from a list of key-value pairsStructs
Drains the map
HashMap implementation that alternates between a vector
and a hashmap to improve performance for low key counts.Into iterator for a Halfbrown map
Iterator over the key value pairs of a Halfbrown map
Mutable iterator over the key value pairs
Iterator over the keys
A view into an occupied entry in a
HashMap.
It is part of the Entry enum.A builder for computing where in a [
HashMap] a key-value pair would be stored.A builder for computing where in a [
HashMap] a key-value pair would be stored.A view into an occupied entry in a
HashMap.
It is part of the RawEntryMut enum.A view into a vacant entry in a
HashMap.
It is part of the RawEntryMut enum.A view into a vacant entry in a
HashMap.
It is part of the Entry enum.Iterator over the values
Mutable iterator over the values
Enums
A view into a single entry in a map, which may either be vacant or occupied.
A view into a single entry in a map, which may either be vacant or occupied.
Constants
Maximum nymber of elements before the representaiton is swapped from
Vec to
HashMapType Definitions
Default hasher for
HashMap.