[#CTxMemPool-exists-07]
= xref:CTxMemPool.adoc[CTxMemPool]::exists
:relfileprefix: ../
:mrdocs:

Returns whether a transaction with the given txid is in the mempool.

== Synopsis

Declared in `<txmempool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
exists(xref:Txid.adoc[Txid] const& txid) const;
----

== Return Value

true if the transaction exists in the mempool.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *txid*
| The txid to look up.
|===


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