[#BaseIndex-m_chain]
= xref:BaseIndex.adoc[BaseIndex]::m&lowbar;chain
:relfileprefix: ../
:mrdocs:

Interface used to query the blockchain the index tracks&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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std::unique&lowbar;ptr&lt;interfaces::Chain&gt; m&lowbar;chain;
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