[#bsl-hash_map-2constructor-031]
= xref:bsl.adoc[bsl]::xref:bsl/hash_map.adoc[hash_map]::hash_map
:relfileprefix: ../../
:mrdocs:

Create an empty hash map that uses allocator `__a`.

== Synopsis

Declared in `<bslstp_hashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
hash_map(xref:bsl/hash_map/allocator_type.adoc[allocator_type] const& __a);
----

== Description

Create an empty hash map using the specified `__a` allocator.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *__a*
| allocator used to supply memory
|===


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