[#kernel-CBlockFileInfo-nUndoSize]
= xref:kernel.adoc[kernel]::xref:kernel/CBlockFileInfo.adoc[CBlockFileInfo]::nUndoSize
:relfileprefix: ../../
:mrdocs:

number of used bytes in the undo file

== Synopsis

Declared in `<node/blockstorage.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint32_t nUndoSize = {};
----


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