[#CChainParams-DeploymentOptions-version_bits_parameters]
= xref:CChainParams.adoc[CChainParams]::xref:CChainParams/DeploymentOptions.adoc[DeploymentOptions]::version&lowbar;bits&lowbar;parameters
:relfileprefix: ../../
:mrdocs:

Per&hyphen;deployment BIP9 version&hyphen;bits activation parameters&period;

== Synopsis

Declared in `&lt;kernel&sol;chainparams&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::unordered&lowbar;map&lt;Consensus::DeploymentPos, VersionBitsParameters&gt; version&lowbar;bits&lowbar;parameters = &lcub;&rcub;;
----


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