[#BloombergLP-bdlb-HashUtil-hash0-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/HashUtil.adoc[HashUtil]::hash0
:relfileprefix: ../../../
:mrdocs:

Return an unsigned integer hash value in the range from zero to one less than the specified `modulus` corresponding to the specified `key`. The behavior is undefined unless `0 < modulus < 2ˆ31`. Note that `modulus` is expected to be a prime not close to an integral power of 2. Also note that specifying a `modulus` of 1 will cause 0 to be returned for every `value`.

== Synopsis

Declared in `<bdlb_hashutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
unsigned int
hash0(
    char key,
    int modulus);
----


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