[#cluster_linearize-DepGraph-GetConnectedComponent]
= xref:cluster_linearize.adoc[cluster_linearize]::xref:cluster_linearize/DepGraph.adoc[DepGraph]::GetConnectedComponent
:relfileprefix: ../../
:mrdocs:

Get the connected component within the subset "todo" that contains tx (which must be in todo).

== Synopsis

Declared in `<cluster_linearize.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
SetType
GetConnectedComponent(
    SetType const& todo,
    xref:cluster_linearize/DepGraphIndex.adoc[DepGraphIndex] tx) const noexcept;
----

== Description

Two transactions are considered connected if they are both in `todo`, and one is an ancestor of the other in the entire graph (so not just within `todo`), or transitively there is a path of transactions connecting them. This does mean that if `todo` contains a transaction and a grandparent, but misses the parent, they will still be part of the same component.

Complexity: O(ret.Count()).

== Return Value

The connected component of tx within todo.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *todo*
| The subset of positions to search within.
| *tx*
| A position in todo whose component is returned.
|===


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