[#BloombergLP-bdlb-HashUtil-hash1-05]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/HashUtil.adoc[HashUtil]::hash1
:relfileprefix: ../../../
:mrdocs:

Return a 32‐bit hash value for the specified `data` of the specified `length`.

== Synopsis

Declared in `<bdlb_hashutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
unsigned int
hash1(
    char const* data,
    int length);
----

== Description

Return an unsigned integer hash value corresponding to the specified `data` of the specified `length` (in bytes). The behavior is undefined unless `0 <= length`. Note that if `data` is 0, then `length` also must be 0. Also note that every byte in `data` is significant; that is, it is not appropriate to cast a `struct` address to a `char *` unless the `struct` is packed (no padding).

Both `hash1` and `hash2` return a hash, but both hashes can be assumed to be independent (i.e., there are no known correlations between the results of the two hash functions given the same input data).

== Return Value

32‐bit hash value for `data`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *data*
| bytes to hash
| *length*
| number of bytes in `data`
|===


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