[#beman-optional-operator_3way-0b]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::operator<=>
:relfileprefix: ../../
:mrdocs:

Three‐way comparison operators

== Synopses

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

Three‐way comparison operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T,
    std::three_way_comparable_with<T> U>
constexpr
std::compare_three_way_result_t<T, U>
xref:beman/optional/operator_3way-0a.adoc[operator<=>](
    xref:beman/optional/optional-03.adoc[optional<T>] const& x,
    xref:beman/optional/optional-03.adoc[optional<U>] const& y);
----

[.small]#xref:beman/optional/operator_3way-0a.adoc[_» more..._]#

Three‐way comparison operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class T>
constexpr
std::strong_ordering
xref:beman/optional/operator_3way-02.adoc[operator<=>](
    xref:beman/optional/optional-03.adoc[optional<T>] const& x,
    xref:beman/optional/nullopt_t.adoc[nullopt_t] rhs) noexcept;
----

[.small]#xref:beman/optional/operator_3way-02.adoc[_» more..._]#

Three‐way comparison operator


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T,
    typename U>
requires (!is_derived_from_optional<U>) && std::three_way_comparable_with<T, U>
constexpr
std::compare_three_way_result_t<T, U>
xref:beman/optional/operator_3way-09.adoc[operator<=>](
    xref:beman/optional/optional-03.adoc[optional<T>] const& x,
    U const& v);
----

[.small]#xref:beman/optional/operator_3way-09.adoc[_» more..._]#


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