[#absl-operator_eq-06f]
= xref:absl.adoc[absl]::operator==
:relfileprefix: ../
:mrdocs:

Tests whether an `optional_ref` is empty.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
constexpr
bool
operator==(
    xref:absl/optional_ref-0c.adoc[optional_ref<T>] a,
    std::nullopt_t b);
----

== Return Value

`true` if `a` is empty.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The reference to test.
| *b*
| The `std::nullopt` tag.
|===


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