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

UpdateTransactionsFromBlock is called when adding transactions from a disconnected block back to the mempool, new mempool entries may have children in the mempool (which is generally not the case when otherwise adding transactions).

== Synopsis

Declared in `<txmempool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f2e1b5a2968, 0x7f2e1b5a2998), requires_capability(0x7f2e2721b978, 0x7f2e2721b9a8), requires_capability(0x7f2e421cd088, 0x7f2e421cd0b8), requires_capability(0x7f2e2880c048, 0x7f2e2880c078), requires_capability(0x7f2e3212f3d8, 0x7f2e3212f408), requires_capability(0x7f2e347f7a68, 0x7f2e347f7a98), requires_capability(0x7f2e2b05bed8, 0x7f2e2b05bf08), requires_capability(0x7f2e2bee3578, 0x7f2e2bee35a8)]]
void
UpdateTransactionsFromBlock(std::vector<Txid> const& vHashesToUpdate);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *vHashesToUpdate* [in]
| The set of txids from the disconnected block that have been accepted back into the mempool.
|===

== Postconditions

* updated descendant state for descendants of each transaction in vHashesToUpdate (excluding any child transactions present in vHashesToUpdate, which are already accounted for). Updated state includes add fee/size information for such descendants to the parent and updated ancestor state to include the parent.


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