[#bsl-hash_set-2constructor-0c]
= xref:bsl.adoc[bsl]::xref:bsl/hash_set.adoc[hash_set]::hash_set
:relfileprefix: ../../
:mrdocs:

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

== Synopsis

Declared in `<bslstp_hashset.h>`

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


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