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

Construct a HeadersSyncState object representing a headers sync via this download‐twice mechanism).

== Synopsis

Declared in `<headerssync.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
HeadersSyncState(
    xref:NodeId-08.adoc[NodeId] id,
    xref:Consensus/Params.adoc[Consensus::Params] const& consensus_params,
    xref:HeadersSyncParams.adoc[HeadersSyncParams] const& params,
    xref:CBlockIndex.adoc[CBlockIndex] const& chain_start,
    xref:arith_uint256.adoc[arith_uint256] const& minimum_required_work);
----

== Description

id: node id (for logging) consensus_params: parameters needed for difficulty adjustment validation chain_start: best known fork point that the peer's headers branch from minimum_required_work: amount of chain work required to accept the chain

== Parameters

[cols="1,4"]
|===
| Name| Description
| *id*
| Node id, used for logging.
| *consensus_params*
| Parameters needed for difficulty adjustment validation.
| *params*
| Tuning parameters for the headers sync buffers.
| *chain_start*
| Best known fork point that the peer's headers branch from.
| *minimum_required_work*
| Chain work required before accepting the chain.
|===


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