[#BloombergLP-bslh-hashAppend-04c]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslh.adoc[bslh]::hashAppend
:relfileprefix: ../../
:mrdocs:

Pass the special value corresponding to the `std::monostate` object to the specified `algorithm`. This function integrates with the `bslh` modular hashing system and effectively provides a `bsl::hash` specialization for `std::monostate`.

== Synopsis

Declared in `<bslh_hashvariant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class HASH_ALGORITHM>
void
hashAppend(
    HASH_ALGORITHM& algorithm,
    std::monostate const&);
----


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