[#CBlockIndex-GetUndoPos]
= xref:CBlockIndex.adoc[CBlockIndex]::GetUndoPos
:relfileprefix: ../
:mrdocs:

Returns the on‐disk position of this block's undo data.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7ff36cbf29a8), requires_capability(0x7ff379204ee8), requires_capability(0x7ff39283aec8), requires_capability(0x7ff3833691e8), requires_capability(0x7ff38bd20d48), requires_capability(0x7ff392c20c08), requires_capability(0x7ff36c161818), requires_capability(0x7ff381ccf368), requires_capability(0x7ff38d75c3b8), requires_capability(0x7ff36872d068), requires_capability(0x7ff3743a6da8)]]
xref:FlatFilePos.adoc[FlatFilePos]
GetUndoPos() const;
----

== Return Value

The file position, or a default position if the undo data is not available.


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