[#BloombergLP-bdlb-BitUtil-log2-023]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitUtil.adoc[BitUtil]::log2
:relfileprefix: ../../../
:mrdocs:

Same as the `unsigned int` overload.

== Synopsis

Declared in `<bdlb_bitutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int
log2(unsigned long long value);
----

== Return Value

base‐2 logarithm of `value` rounded up to the nearest integer

== Parameters

[cols="1,4"]
|===
| Name| Description
| *value*
| value whose base‐2 logarithm is returned
|===


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