[#CRollingBloomFilter-2constructor]
= xref:CRollingBloomFilter.adoc[CRollingBloomFilter]::CRollingBloomFilter
:relfileprefix: ../
:mrdocs:

Construct a rolling filter sized for a number of elements and a false‐positive rate.

== Synopsis

Declared in `<common/bloom.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CRollingBloomFilter(
    unsigned int nElements,
    double nFPRate);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nElements*
| Number of most‐recent elements to track.
| *nFPRate*
| Desired false‐positive rate.
|===


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