[#ImprovesFeerateDiagram]
= ImprovesFeerateDiagram
:mrdocs:

The replacement transaction must improve the feerate diagram of the mempool.

== Synopsis

Declared in `<policy/rbf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<std::pair<DiagramCheckError, std::string>>
ImprovesFeerateDiagram(xref:CTxMemPool/ChangeSet.adoc[CTxMemPool::ChangeSet]& changeset);
----

== Return Value

error type and string if mempool diagram doesn't improve, otherwise std::nullopt.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *changeset* [in]
| The changeset containing proposed additions/removals
|===


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