[#BloombergLP-bslh-hashAppend-08c]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslh.adoc[bslh]::hashAppend
:relfileprefix: ../../
:mrdocs:

Append a filesystem path to a hash algorithm.

== Synopsis

Declared in `<bslh_filesystem.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class HASHALG>
void
hashAppend(
    HASHALG& hashAlg,
    std::filesystem::path const& path);
----

== Description

Pass the specified `path` to the specified `hashAlg` hashing algorithm of the (template parameter) type `HASHALG`. Note that this function violates the BDE coding standard, adding a function for a namespace for a different package, and none of the function parameters are from this package either. This is necessary in order to provide an implementation of `bslh::hashAppend` for the (native) standard library `std::filesystem::path` type as we are not allowed to add overloads directly into namespace `std`. Also note that this will NOT be found by the compiler if `HASHALG` is not in `BloombergLP::bslh`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hashAlg*
| hashing algorithm that receives the path hash input
| *path*
| filesystem path whose hash value is appended
|===


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