[#absl-operator_not_eq-018]
= xref:absl.adoc[absl]::operator!=
:relfileprefix: ../
:mrdocs:

Tests whether two `optional_ref`s differ.

== Synopsis

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

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

== Return Value

`true` if the operands are not equal.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The left operand.
| *b*
| The right operand.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#