[#BloombergLP-bdlb-BitStringUtil-find1AtMaxIndex-0c]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitStringUtil.adoc[BitStringUtil]::find1AtMaxIndex
:relfileprefix: ../../../
:mrdocs:

Return the index of the most‐significant 1 bit in `bitString`.

== Synopsis

Declared in `<bdlb_bitstringutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
std::size_t
find1AtMaxIndex(
    uint64_t const* bitString,
    std::size_t length);
----

== Description

Return the index of the most‐significant 1 bit in the specified `bitString` having the specified `length`, if such a bit exists, and `k_INVALID_INDEX` otherwise.

== Return Value

index of the most‐significant 1 bit, or `k_INVALID_INDEX`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bitString*
| bit string to search
| *length*
| number of bits in `bitString`
|===


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