[#bsl-optional-072-transform-06b]
= xref:bsl.adoc[bsl]::xref:bsl/optional-072.adoc[optional]::transform
:relfileprefix: ../../
:mrdocs:

Apply the specified `func` to the contained value and return the result as an rvalue optional.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_FUNC>
constexpr
auto
transform(t_FUNC&& func) &&;
----

== Return Value

`optional` containing the result of `func`, or empty if disengaged

== Parameters

[cols="1,4"]
|===
| Name| Description
| *func*
| callable invoked with the contained value or when empty
|===


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