[#BloombergLP-bdlb-hashAppend-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::hashAppend
:relfileprefix: ../../
:mrdocs:

Pass the boolean value of whether the specified `input` references a non‐empty nullable value to the specified `hashAlg` hashing algorithm of (template parameter) type `HASHALG`. If `input.has_value` is true, additionally pass the value to `hashAlg`.

== Synopsis

Declared in `<bdlb_nullablevalueref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class HASHALG,
    class TYPE>
void
hashAppend(
    HASHALG& hashAlg,
    xref:BloombergLP/bdlb/ConstNullableValueRef.adoc[ConstNullableValueRef<TYPE>] const& input);
----


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