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

Deleted to forbid a naked `nullptr`; use `std::nullopt` instead.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
optional_ref(std::nullptr_t input) = delete;
----

== Parameters

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


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