[#interfaces-BlockInfo-undo_data]
= xref:interfaces.adoc[interfaces]::xref:interfaces/BlockInfo.adoc[BlockInfo]::undo_data
:relfileprefix: ../../
:mrdocs:

Pointer to the block undo data, or null when not loaded.

== Synopsis

Declared in `<kernel/chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:CBlockUndo.adoc[CBlockUndo] const* undo_data = nullptr;
----


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