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

Perform a lexicographic three‐way comparison of the specified `lhs` and the specified `rhs` pairs by using the comparison operators of `T1` and `T2`; return the result of that comparison.

== Synopsis

Declared in `<bslstl_pair.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class T1,
    class T2>
constexpr
std::common_comparison_category_t<BloombergLP::bslalg::SynthThreeWayUtil::Result<T1>, BloombergLP::bslalg::SynthThreeWayUtil::Result<T2>>
operator<=>(
    xref:bsl/pair-0b.adoc[pair<T1, T2>] const& lhs,
    xref:bsl/pair-0b.adoc[pair<T1, T2>] const& rhs);
----


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