[#bsl-operator_3way-09]
= xref:bsl.adoc[bsl]::operator<=>
:relfileprefix: ../
:mrdocs:

If `lhs` and `rhs` are not valueless by exception and hold the same alternative `i`, return `get(lhs) <=> get(rhs)` . If `lhs` and `rhs` are not valueless by exception and hold the aalternatives `i` and `j` respectively, return `i<=>j`. Return `strong_ordering::equal` if both variants are valueless by exception. Return `strong_ordering::less` if `lhs` is valueless by exception. Return `strong_ordering::greater` if `rhs` is valueless by exception.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... t_ALTS>
requires (std::three_way_comparable<t_ALTS> && ...)
constexpr
std::common_comparison_category_t<std::compare_three_way_result_t<t_ALTS>...>
operator<=>(
    xref:bsl/variant.adoc[variant<t_ALTS...>] const& lhs,
    xref:bsl/variant.adoc[variant<t_ALTS...>] const& rhs);
----


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