[#BloombergLP-bdljsn-hashAppend-0ee]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::hashAppend
:relfileprefix: ../../
:mrdocs:

Pass the specified `object` to the specified `hashAlgorithm`. This function allows `JsonNull` objects to be hashable using `bsl::hash`. Note that `object` always as the same value so, for a given state of `hashAppend`, the effect of calling `hashAppend` is always the same.

== Synopsis

Declared in `<bdljsn_jsonnull.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class HASHALG>
void
hashAppend(
    HASHALG& hashAlgorithm,
    xref:BloombergLP/bdljsn/JsonNull-0b.adoc[JsonNull] const& object);
----


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