[#EntriesAndTxidsDisjoint]
= EntriesAndTxidsDisjoint
:mrdocs:

Check the intersection between two sets of transactions (a set of mempool entries and a set of txids) to make sure they are disjoint.

== Synopsis

Declared in `<policy/rbf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<std::string>
EntriesAndTxidsDisjoint(
    xref:CTxMemPool/setEntries.adoc[CTxMemPool::setEntries] const& ancestors,
    std::set<Txid> const& direct_conflicts,
    xref:Txid.adoc[Txid] const& txid);
----

== Return Value

error message if the sets intersect, std::nullopt if they are disjoint.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ancestors* [in]
| Set of mempool entries corresponding to ancestors of the replacement transactions.
| *direct_conflicts* [in]
| Set of txids corresponding to the mempool conflicts (candidates to be replaced).
| *txid* [in]
| Transaction ID, included in the error message if violation occurs.
|===


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