[#beman-optional-operator_not_eq-0d8]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::operator!=
:relfileprefix: ../../
:mrdocs:

Compares an optional against a value for inequality.

== Synopsis

Declared in `<beman/optional/optional.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T,
    typename U>
constexpr
bool
operator!=(
    xref:beman/optional/optional-03.adoc[optional<T>] const& lhs,
    U const& rhs)
requires (!detail::is_optional<U>) && detail::optional_ne_rel<T, U>;
----

== Return Value

`true` if `lhs` is disengaged or its contained value differs from `rhs.`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The optional operand.
| *rhs*
| The value operand.
|===


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