[#BloombergLP-bslalg-SynthThreeWayUtil-compare]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/SynthThreeWayUtil.adoc[SynthThreeWayUtil]::compare
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Return the result of `t1 <=> t2` expression if this expression is valid. Otherwise, if `t1 < t2` and `t2 < t1` expressions are well‐formed and return boolean‐testable results, use the `<` operator to emulate `<=>`. Otherwise this function is not defined and does not participate in overload resolution. Note that this is an implementation of the exposition‐only callable object `synth‐three‐way` defined by the ISO C++20 Standard [expos.only.entity].

== Synopsis

Declared in `<bslalg_synththreewayutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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inline constexpr static
xref:BloombergLP/bslalg/SynthThreeWayUtil/_01record.adoc[] compare = {};
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