[#BlockFilter-2constructor-04]
= xref:BlockFilter.adoc[BlockFilter]::BlockFilter
:relfileprefix: ../
:mrdocs:

Construct a new BlockFilter of the specified type from a block.

== Synopsis

Declared in `<blockfilter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
BlockFilter(
    xref:BlockFilterType.adoc[BlockFilterType] filter_type,
    xref:CBlock.adoc[CBlock] const& block,
    xref:CBlockUndo.adoc[CBlockUndo] const& block_undo);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *filter_type*
| The type of filter to build.
| *block*
| The block to build the filter from.
| *block_undo*
| Undo data for the block, providing spent outputs.
|===


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