[#BloombergLP-ball-CategoryManager_RadixTree_ChildNodeGuard]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::CategoryManager_RadixTree_ChildNodeGuard
:relfileprefix: ../../
:mrdocs:

RAII guard that removes a child node on exception during value emplacement.

== Synopsis

Declared in `<ball_categorymanager_radixtree.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_VALUE>
class CategoryManager_RadixTree_ChildNodeGuard;
----

== Description

This guard ensures exception safety by automatically removing a newly created child node from its parent if the value construction throws an exception.

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/ball/CategoryManager_RadixTree_ChildNodeGuard/ChildIterator.adoc[`ChildIterator`] 
| Iterator over the child nodes of a radix tree node.
| xref:BloombergLP/ball/CategoryManager_RadixTree_ChildNodeGuard/Node.adoc[`Node`] 
| `Node` is an alias for a node in the radix tree.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/ball/CategoryManager_RadixTree_ChildNodeGuard/2constructor.adoc[`CategoryManager_RadixTree_ChildNodeGuard`]         [.small]#[constructor]#
| Create a guard managing the specified `child` in the specified `parent`.
| xref:BloombergLP/ball/CategoryManager_RadixTree_ChildNodeGuard/2destructor.adoc[`~CategoryManager_RadixTree_ChildNodeGuard`] [.small]#[destructor]#
| Destroy this guard. If `release()` has not been called, erase the child node from the parent (specified at construction).
| xref:BloombergLP/ball/CategoryManager_RadixTree_ChildNodeGuard/release.adoc[`release`] 
| Release this guard so the child is not erased on destruction.
|===



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