[#BloombergLP-bdlb-BitUtil-log2-02d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/BitUtil.adoc[BitUtil]::log2
:relfileprefix: ../../../
:mrdocs:

Return the base‐2 logarithm of the specified `value` rounded up to the nearest integer. The behavior is undefined unless `0 < value`.

== Synopsis

Declared in `<bdlb_bitutil.h>`

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


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