[#BloombergLP-ball-CategoryManager_RadixTree-find-07]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/CategoryManager_RadixTree.adoc[CategoryManager_RadixTree]::find
:relfileprefix: ../../../
:mrdocs:

Return a non‐modifiable reference to the value for `key`, if present.

== Synopsis

Declared in `<ball_categorymanager_radixtree.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/ball/CategoryManager_RadixTree/OptValueCRef.adoc[CategoryManager_RadixTree<t_VALUE>::OptValueCRef]
find(std::string_view const& key) const;
----

== Description

Return an optional containing a reference to the non‐modifiable value associated with the specified `key`, or an empty optional if the key is not found. The returned reference remains valid until the tree is modified.

== Return Value

optional reference to the value, or empty if not found

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key to look up
|===


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