[#bsl-hashAppend-03]
= xref:bsl.adoc[bsl]::hashAppend
:relfileprefix: ../
:mrdocs:

Pass the specified `input` to the specified `hashAlg`, where `hashAlg` is a hashing algorithm.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_HASHALG,
    class t_TYPE>
void
hashAppend(
    t_HASHALG& hashAlg,
    xref:bsl/optional-072.adoc[optional<t_TYPE>] const& input);
----


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