[#bsl-hash_set-2constructor-07c]
= xref:bsl.adoc[bsl]::xref:bsl/hash_set.adoc[hash_set]::hash_set
:relfileprefix: ../../
:mrdocs:

Create a hash set with the specified hasher, equality predicate, and allocator.

== Synopsis

Declared in `<bslstp_hashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
hash_set(
    xref:bsl/hash_set/size_type.adoc[size_type] __n,
    xref:bsl/hash_set/hasher.adoc[hasher] const& __hf,
    xref:bsl/hash_set/key_equal.adoc[key_equal] const& __eql,
    xref:bsl/hash_set/allocator_type.adoc[allocator_type] const& __a = allocator_type());
----


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