[#BloombergLP-bslstl-Optional_Base-05-value_or-09]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Optional_Base-05.adoc[Optional_Base]::value_or
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:mrdocs:

Return the contained value, or a converted fallback if disengaged.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_ANY_TYPE>
t_TYPE
value_or(t_ANY_TYPE&& value) &&;
----

== Description

Return a copy of the underlying object of a (template parameter) `t_TYPE` if this object is non‐null, and the specified `value` converted to `t_TYPE` otherwise. Note that this method returns _by_ _value_, so may be inefficient in some contexts.

== Return Value

contained value if engaged, otherwise `value` converted to `t_TYPE`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *value*
| value compared with or used to initialize the optional
|===


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