[#LastCommonAncestor]
= LastCommonAncestor
:mrdocs:

Find the forking point between two chain tips.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:CBlockIndex.adoc[CBlockIndex] const*
LastCommonAncestor(
    xref:CBlockIndex.adoc[CBlockIndex] const* pa,
    xref:CBlockIndex.adoc[CBlockIndex] const* pb);
----

== Return Value

The most recent common ancestor of the two entries, or nullptr if none.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pa*
| The first block index entry.
| *pb*
| The second block index entry.
|===


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