[#absl-optional_ref-0c-2constructor-0e1]
= xref:absl.adoc[absl]::xref:absl/optional_ref-0c.adoc[optional_ref]::optional_ref
:relfileprefix: ../../
:mrdocs:

Constructs an empty `optional_ref`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
optional_ref();
----


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