[#bsl-operator_3way-0d1]
= xref:bsl.adoc[bsl]::operator<=>
:relfileprefix: ../
:mrdocs:

Perform a three‐way comparison of the operands.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_TYPE>
constexpr
std::strong_ordering
operator<=>(
    xref:bsl/optional-072.adoc[bsl::optional<t_TYPE>] const& value,
    xref:bsl/nullopt_t.adoc[bsl::nullopt_t] nullopt) noexcept;
----

== Description

Perform a three‐way comparison of the specified `value` and `nullopt`; return the result of that comparison. This function can be called in constant expressions only if `t_TYPE` is not allocator‐aware.

== Return Value

result of the three‐way comparison

== Parameters

[cols="1,4"]
|===
| Name| Description
| *value*
| value compared with or used to initialize the optional
| *nullopt*
| disengaged‐optional tag; value is unused
|===


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