[#absl-optional_ref-0c-2constructor-06]
= xref:absl.adoc[absl]::xref:absl/optional_ref-0c.adoc[optional_ref]::optional_ref
:relfileprefix: ../../
:mrdocs:

Constructs an `optional_ref` from a const `std::optional`.

== Synopsis

Declared in `<absl/types/optional_ref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename U,
    typename = xref:absl/optional_ref-0c.adoc[EnableIfConvertibleFrom<U const>]>
constexpr
optional_ref(std::optional<U> const& input);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The optional whose value (if any) is referred to.
|===


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