[#BloombergLP-bdlb-operator_3way-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::operator<=>
:relfileprefix: ../../
:mrdocs:

Three‐way comparison operators

== Synopses

Declared in `<bdlb_nullablevalue.h>`

Perform a three‐way comparison of the specified `lhs` and the specified `rhs` objects by using the comparison operators of `t_LHS` and `t_RHS`; return the result of that comparison.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    bsl::three_way_comparable_with<LHS_TYPE> RHS_TYPE>
constexpr
std::compare_three_way_result_t<LHS_TYPE, RHS_TYPE>
xref:BloombergLP/bdlb/operator_3way-03.adoc[operator<=>](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<RHS_TYPE>] const& rhs);
----

[.small]#xref:BloombergLP/bdlb/operator_3way-03.adoc[_» more..._]#

Perform a three‐way comparison of the specified nullable objects.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    bsl::three_way_comparable_with<LHS_TYPE> RHS_TYPE>
constexpr
std::compare_three_way_result_t<LHS_TYPE, RHS_TYPE>
xref:BloombergLP/bdlb/operator_3way-04.adoc[operator<=>](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    xref:bsl/optional-072.adoc[bsl::optional<RHS_TYPE>] const& rhs);
----

[.small]#xref:BloombergLP/bdlb/operator_3way-04.adoc[_» more..._]#

Perform a three‐way comparison of the specified nullable objects.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    bsl::three_way_comparable_with<LHS_TYPE> RHS_TYPE>
constexpr
std::compare_three_way_result_t<LHS_TYPE, RHS_TYPE>
xref:BloombergLP/bdlb/operator_3way-0a.adoc[operator<=>](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    std::optional<RHS_TYPE> const& rhs);
----

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

Perform a three‐way comparison of the specified nullable object and value.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LHS_TYPE,
    class RHS_TYPE>
requires (!bdlb::NullableValue_DerivedFromOptional<RHS_TYPE>) &&
              bsl::three_way_comparable_with<LHS_TYPE, RHS_TYPE>
constexpr
std::compare_three_way_result_t<LHS_TYPE, RHS_TYPE>
xref:BloombergLP/bdlb/operator_3way-0b.adoc[operator<=>](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<LHS_TYPE>] const& lhs,
    RHS_TYPE const& rhs);
----

[.small]#xref:BloombergLP/bdlb/operator_3way-0b.adoc[_» more..._]#

Perform a three‐way comparison of the specified `value` and one of type `bsl::nullopt_t`; return the result of that comparison.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
constexpr
std::strong_ordering
xref:BloombergLP/bdlb/operator_3way-07.adoc[operator<=>](
    xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue<TYPE>] const& value,
    xref:bsl/nullopt_t.adoc[bsl::nullopt_t] const&) noexcept;
----

[.small]#xref:BloombergLP/bdlb/operator_3way-07.adoc[_» more..._]#


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