[#absl-optional_ref-0c-2constructor-0b]
= xref:absl.adoc[absl]::xref:absl/optional_ref-0c.adoc[optional&lowbar;ref]::optional&lowbar;ref
:relfileprefix: ../../
:mrdocs:

Deleted to forbid a naked `nullptr`&semi; use `std&colon;&colon;nullopt` instead&period;

== Synopsis

Declared in `&lt;absl&sol;types&sol;optional&lowbar;ref&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
optional&lowbar;ref(std::nullptr&lowbar;t input) = delete;
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The `nullptr` literal&period;
|===


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