[#absl-optional_ref-0c-2constructor-0e0]
= xref:absl.adoc[absl]::xref:absl/optional_ref-0c.adoc[optional_ref]::optional_ref
:relfileprefix: ../../
:mrdocs:

Converts from an `optional_ref<U>` when `U*` converts to `T*`.

== 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>]>
constexpr
optional_ref(xref:absl/optional_ref-0c.adoc[optional_ref<U>] input);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The source reference to convert from.
|===


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