[#beman-optional-operator_3way-05]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::operator<=>
:relfileprefix: ../../
:mrdocs:

Three‐way comparison of an optional against `nullopt`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class T>
constexpr
std::strong_ordering
operator<=>(
    xref:beman/optional/optional-03.adoc[optional<T>] const& lhs,
    xref:beman/optional/nullopt_t.adoc[nullopt_t] rhs) noexcept;
----

== Return Value

`equivalent` if `lhs` is disengaged, otherwise `greater`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The optional to compare.
| *rhs*
| The `nullopt` operand.
|===


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