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

Construct a block assembler for a given chainstate and mempool.

== Synopsis

Declared in `<node/miner.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
BlockAssembler(
    xref:Chainstate.adoc[Chainstate]& chainstate,
    xref:CTxMemPool.adoc[CTxMemPool] const* mempool,
    xref:node/BlockCreateOptions.adoc[BlockCreateOptions] create_options);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *chainstate*
| The chainstate to build the block on top of.
| *mempool*
| The mempool to draw transactions from, or nullptr for an empty block.
| *create_options*
| Options controlling block‐template creation.
|===


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