[#bsl-operator_3way-03e]
= xref:bsl.adoc[bsl]::operator<=>
:relfileprefix: ../
:mrdocs:

Return the three‐way comparison of the specified stacks; see the non‐member `operator<=>` in the `bsl` namespace.

== Synopsis

Declared in `<bslstl_stack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class VAL,
    three_way_comparable CONT>
compare_three_way_result_t<CONT>
operator<=>(
    xref:bsl/stack-05.adoc[stack<VAL, CONT>] const& lhs,
    xref:bsl/stack-05.adoc[stack<VAL, CONT>] const& rhs);
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:bsl/stack-05.adoc[stack], declared only inside that class: it can be found only through argument-dependent lookup.
====

== Return Value

result of the three‐way comparison

== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| left‐hand stack operand
| *rhs*
| right‐hand stack operand
|===


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