[#BlockFilterIndex-LookupFilter]
= xref:BlockFilterIndex.adoc[BlockFilterIndex]::LookupFilter
:relfileprefix: ../
:mrdocs:

Get a single filter by block.

== Synopsis

Declared in `<index/blockfilterindex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
LookupFilter(
    xref:CBlockIndex.adoc[CBlockIndex] const* block_index,
    xref:BlockFilter.adoc[BlockFilter]& filter_out) const;
----

== Return Value

True if the filter was found.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block_index*
| Block to look up the filter for.
| *filter_out*
| Set to the filter that was found.
|===


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