[#BloombergLP-bslh-hashAppend-082]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslh.adoc[bslh]::hashAppend
:relfileprefix: ../../
:mrdocs:

Passes the specified `input` into the specified `hashAlg` to be combined into the internal state of the algorithm which is used to produce the resulting hash value. Note that the `enable_if` meta‐function is used to enable this `hashAppend` function for only floating point (excluding `long double`) types, because these types need to have +/‐0.0 normalized to 0.0 before they can be hashed as a continuous sequence of bytes. Also note that this function is defined inline because MS Visual Studio compilers before 2013 require (some) functions declared using enable_if be in‐place inline.

== Synopsis

Declared in `<bslh_hash.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class HASH_ALGORITHM,
    class TYPE>
void
hashAppend(
    HASH_ALGORITHM& hashAlg,
    TYPE input)
requires bsl::is_floating_point<TYPE>::value &&
   !bsl::is_same<TYPE, long double>::value;
----


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