[#CTxMemPool-ChangeSet-CalculateMemPoolAncestors]
= xref:CTxMemPool.adoc[CTxMemPool]::xref:CTxMemPool/ChangeSet.adoc[ChangeSet]::CalculateMemPoolAncestors
:relfileprefix: ../../
:mrdocs:

Calculate the in‐mempool ancestors of a staged transaction, caching the result.

== Synopsis

Declared in `<txmempool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:CTxMemPool/setEntries.adoc[CTxMemPool::setEntries]
CalculateMemPoolAncestors(xref:CTxMemPool/ChangeSet/TxHandle.adoc[TxHandle] tx);
----

== Return Value

The in‐mempool ancestors, excluding transactions in the changeset itself.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *tx*
| Handle to the staged transaction.
|===


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