A C++20 Preview: operator ＜=＞
summary
A new operator<=> (the three‑way or "spaceship" operator) is being added for C++20 with precedence and associativity defined and library support proposed as <cmp>. A one‑line memberwise compare can be defaulted to generate all six relational operators, or users supply a single definition that returns a chosen ordering category (strong/weak/partial). Committee wording exists but no compiler implementation yet; vendors are waiting and implementations on GCC/Clang are requested so the feature can be exercised.
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