[#bsl-unordered_multimap-0b0-hash_function]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap]::hash_function
:relfileprefix: ../../
:mrdocs:

Return (a copy of) the hash unary functor used by this unordered multimap to generate a hash value (of type `size_type`) for a `key_type` object.

== Synopsis

Declared in `<bslstl_unorderedmultimap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/hasher.adoc[unordered_multimap<KEY, VALUE, HASH, EQUAL, ALLOCATOR>::hasher]
hash_function() const;
----


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