[#bsl-unordered_map-0bf-hash_function]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::hash_function
:relfileprefix: ../../
:mrdocs:

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

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlb/TransparentHash.adoc[TransparentHash]
hash_function() const;
----


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