[#BloombergLP-bslstl-Optional_ImmovableHelper]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional_ImmovableHelper
:relfileprefix: ../../
:mrdocs:

This struct is used to implement direct initialization of the private data member of the `std::optional` class, which makes it possible to support immovable types returned from the `transform` member function.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_TYPE,
    class t_INVOCABLE,
    class t_ARG>
struct Optional_ImmovableHelper;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Optional_ImmovableHelper/2conversion.adoc[`operator t_TYPE`] 
| Invoke `invocable` with `arg` and return the result as `t_TYPE`.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Optional_ImmovableHelper/arg.adoc[`arg`] 
| argument forwarded to `invocable`
| xref:BloombergLP/bslstl/Optional_ImmovableHelper/invocable.adoc[`invocable`] 
| callable invoked to produce the result
|===



[.small]#Created with https://www.mrdocs.com[MrDocs]#