[−][src]Crate halfbrown

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 lager 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

hashmap

Create a HashMap from a list of key-value pairs

Structs

Drain	Drains the map
HashMap	`HashMap` implementation that alternates between a vector and a hashmap to improve performance for low key counts.
IntoIter	Into iterator for a Halfbrown map
Iter	Iterator over the key value pairs of a Halfbrown map
IterMut	Mutable iterator over the key value pairs
Keys	Iterator over the keys
OccupiedEntry	A view into an occupied entry in a `HashMap`. It is part of the `Entry` enum.
RawEntryBuilder	A builder for computing where in a `HashMap` a key-value pair would be stored.
RawEntryBuilderMut	A builder for computing where in a `HashMap` a key-value pair would be stored.
RawOccupiedEntryMut	A view into an occupied entry in a `HashMap`. It is part of the `RawEntryMut` enum.
RawVacantEntryMut	A view into a vacant entry in a `HashMap`. It is part of the `RawEntryMut` enum.
VacantEntry	A view into a vacant entry in a `HashMap`. It is part of the `Entry` enum.
Values	Iterator over the values
ValuesMut	Mutable iterator over the values

Enums

Entry	A view into a single entry in a map, which may either be vacant or occupied.
RawEntryMut	A view into a single entry in a map, which may either be vacant or occupied.

Constants

VEC_LIMIT_UPPER

Maximum nymber of elements before the representaiton is swapped from Vec to HashMap

Type Definitions

DefaultHashBuilder

Default hasher for HashMap.