[#BloombergLP-bslh-hashAppend-058]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslh.adoc[bslh]::hashAppend
:relfileprefix: ../../
:mrdocs:

Append the active alternative of a `std::variant` to a hash algorithm.

== Synopsis

Declared in `<bslh_hashvariant.h>`

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

== Description

Pass the index of the active variant of the specified `input` to the specified `algorithm`, followed by the active value itself, to be combined into the internal state of the algorithm that is used to produce the resulting hash value.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *algorithm*
| hashing algorithm that combines the variant state
| *input*
| variant whose active alternative is hashed
|===


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