[#bitset_detail-PopCount]
= xref:bitset_detail.adoc[bitset_detail]::PopCount
:relfileprefix: ../
:mrdocs:

Count the number of bits set in an unsigned integer type.

== Synopsis

Declared in `<util/bitset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename I>
constexpr
unsigned int
PopCount(I v);
----

== Return Value

The number of 1 bits in v.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *v*
| The integer whose set bits are counted.
|===


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