[#llvm-transformOptional]
= xref:llvm.adoc[llvm]::transformOptional
:relfileprefix: ../
:mrdocs:

Apply `F` to the contained value of `O` if present.

== Synopsis

Declared in `<llvm/ADT/STLForwardCompat.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Optional,
    typename Function,
    typename Value = llvm::remove_cvref_t<Optional>::value_type>
constexpr
std::optional<remove_cvref_t<std::invoke_result_t<Function, Value>>>
transformOptional(
    Optional&& O,
    Function&& F);
----

== Return Value

An optional with the result of `F,` or `std::nullopt` if `O` is empty.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *O*
| Optional value to transform.
| *F*
| Function applied to the contained value when present.
|===


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