[#absl-flat_hash_map]
= xref:absl.adoc[absl]::flat_hash_map
:relfileprefix: ../
:mrdocs:

An unordered associative container of unique keys and associated values, optimized for speed and memory footprint.

== Synopsis

Declared in `<absl/container/flat_hash_map.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class K,
    class V,
    class Hash = /* implementation-defined */::DefaultHash,
    class Eq = /* implementation-defined */::DefaultEq,
    class Allocator = /* implementation-defined */::DefaultAlloc>
class flat_hash_map
    : public /* implementation-defined */::InstantiateRawHashMap</* implementation-defined */, Hash, Eq, Allocator>::type
----

== Description

An `absl::flat_hash_map<K, V>` is an unordered associative container which has been optimized for both speed and memory footprint in most common use cases. Its interface is similar to that of `std::unordered_map<K, V>`.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `/* implementation-defined */::InstantiateRawHashMap</* implementation-defined */, Hash, Eq, Allocator>::type`
| 
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:absl/flat_hash_map/2constructor.adoc[`flat_hash_map`]         [.small]#[constructor]#
| Constructs an empty `flat_hash_map`.
|===


== Using Declarations

[cols="1"]
|===
| Name
| xref:absl/flat_hash_map/_10using.adoc[`Unnamed using`] 
| xref:absl/flat_hash_map/at.adoc[`at`] 
| xref:absl/flat_hash_map/begin.adoc[`begin`] 
| xref:absl/flat_hash_map/bucket_count.adoc[`bucket_count`] 
| xref:absl/flat_hash_map/capacity.adoc[`capacity`] 
| xref:absl/flat_hash_map/cbegin.adoc[`cbegin`] 
| xref:absl/flat_hash_map/cend.adoc[`cend`] 
| xref:absl/flat_hash_map/clear.adoc[`clear`] 
| xref:absl/flat_hash_map/contains.adoc[`contains`] 
| xref:absl/flat_hash_map/count.adoc[`count`] 
| xref:absl/flat_hash_map/emplace.adoc[`emplace`] 
| xref:absl/flat_hash_map/emplace_hint.adoc[`emplace_hint`] 
| xref:absl/flat_hash_map/empty.adoc[`empty`] 
| xref:absl/flat_hash_map/end.adoc[`end`] 
| xref:absl/flat_hash_map/equal_range.adoc[`equal_range`] 
| xref:absl/flat_hash_map/erase.adoc[`erase`] 
| xref:absl/flat_hash_map/extract.adoc[`extract`] 
| xref:absl/flat_hash_map/find.adoc[`find`] 
| xref:absl/flat_hash_map/get_allocator.adoc[`get_allocator`] 
| xref:absl/flat_hash_map/hash_function.adoc[`hash_function`] 
| xref:absl/flat_hash_map/insert.adoc[`insert`] 
| xref:absl/flat_hash_map/insert_or_assign.adoc[`insert_or_assign`] 
| xref:absl/flat_hash_map/key_eq.adoc[`key_eq`] 
| xref:absl/flat_hash_map/load_factor.adoc[`load_factor`] 
| xref:absl/flat_hash_map/max_load_factor.adoc[`max_load_factor`] 
| xref:absl/flat_hash_map/max_size.adoc[`max_size`] 
| xref:absl/flat_hash_map/merge.adoc[`merge`] 
| xref:absl/flat_hash_map/operator[].adoc[`operator[]`] 
| xref:absl/flat_hash_map/rehash.adoc[`rehash`] 
| xref:absl/flat_hash_map/reserve.adoc[`reserve`] 
| xref:absl/flat_hash_map/size.adoc[`size`] 
| xref:absl/flat_hash_map/swap.adoc[`swap`] 
| xref:absl/flat_hash_map/try_emplace.adoc[`try_emplace`] 
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:absl/GetAllFlags.adoc[`GetAllFlags`]
| Returns current state of the Flags registry in a form of mapping from flag name to a flag reflection handle.
| xref:absl/erase_if-08b.adoc[`erase_if`]
| Erases all elements that satisfy the predicate `pred` from the container `c`.
| xref:absl/swap-03.adoc[`swap`]
| Swaps the contents of two `flat_hash_map` containers.
|===


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