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

Get a single filter header by block&period;

== Synopsis

Declared in `&lt;index&sol;blockfilterindex&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;requires&lowbar;capability(0x7f95263098d8)&rsqb;&rsqb;
bool
LookupFilterHeader(
    xref:CBlockIndex.adoc[CBlockIndex] const* block&lowbar;index,
    xref:uint256.adoc[uint256]& header&lowbar;out);
----

== Return Value

True if the filter header was found&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block&lowbar;index*
| Block to look up the filter header for&period;
| *header&lowbar;out*
| Set to the filter header that was found&period;
|===


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