[#TxGraph-Exists]
= xref:TxGraph.adoc[TxGraph]::Exists
:relfileprefix: ../
:mrdocs:

Determine whether arg exists in the graph (i.e., was not removed). This is available even for oversized graphs.

== Synopsis

Declared in `<txgraph.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
bool
Exists(
    xref:TxGraph/Ref.adoc[Ref] const& arg,
    xref:TxGraph/Level.adoc[Level] level) noexcept = 0;
----

== Return Value

True if the transaction exists in the selected graph.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *arg*
| Reference to the transaction to look up.
| *level*
| Which graph (main or staging) to query.
|===


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