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

The return type of adding a value to the tree with `emplace()`. It is _not_ the usual `insert` return type, because this data structure does not provide an iterator. The `.first` boolean is `true` if an element was inserted, and the `.second` data member is a reference to the (possibly newly created) value. Notice that if the value existed (`.first == false`) the reference wrapper will still give access to the value of that node; the `.second` is always a valid mutable reference to the value belonging to the key used in the `emplace` call.

== Synopsis

Declared in `<ball_categorymanager_radixtree.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:bsl/pair-0b.adoc[bsl::pair<bool, bsl::reference_wrapper<t_VALUE>>] EmplaceResult;
----


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