[#Chainstate-MaybeUpdateMempoolForReorg]
= xref:Chainstate.adoc[Chainstate]::MaybeUpdateMempoolForReorg
:relfileprefix: ../
:mrdocs:

Make mempool consistent after a reorg, by re‐adding or recursively erasing disconnected block transactions from the mempool, and also removing any other transactions from the mempool that are no longer valid given the new tip/height.

== Synopsis

Declared in `<validation.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f9513ab5e08, 0x7f9513ab5e80), requires_capability(0x7f9502c98e78, 0x7f9502c98ef0), requires_capability(0x7f952544aba8, 0x7f952544ac20), requires_capability(0x7f9517400e88, 0x7f9517400f00)]]
void
MaybeUpdateMempoolForReorg(
    xref:DisconnectedBlockTransactions.adoc[DisconnectedBlockTransactions]& disconnectpool,
    bool fAddToMempool);
----

== Description

Note: we assume that disconnectpool only contains transactions that are NOT confirmed in the current chain nor already in the mempool (otherwise, in‐mempool descendants of such transactions would be removed).

Passing fAddToMempool=false will skip trying to add the transactions back, and instead just erase from the mempool as needed.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *disconnectpool*
| Transactions from disconnected blocks to re‐add or erase.
| *fAddToMempool*
| Whether to try re‐adding the disconnected transactions.
|===


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