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cppdraft/cmp/result.md

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+[cmp.result]
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+# 17 Language support library [[support]](./#support)
+
+## 17.12 Comparisons [[cmp]](cmp#result)
+
+### 17.12.5 Result of three-way comparison [cmp.result]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L5460)
+
+The behavior of a program
+that adds specializations for the compare_three_way_result template
+defined in this subclause is undefined[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L5465)
+
+For the compare_three_way_result type trait
+applied to the types T and U,
+let t and u denote lvalues of typesconst remove_reference_t<T> and const remove_reference_t<U>,
+respectively[.](#2.sentence-1)
+
+If the expression t <=> u is well-formed
+when treated as an unevaluated operand ([[expr.context]](expr.context "7.2.3 Context dependence")),
+the member [*typedef-name*](dcl.typedef#nt:typedef-name "9.2.4 The typedef specifier [dcl.typedef]") type denotes the type decltype(t <=> u)[.](#2.sentence-2)
+
+Otherwise, there is no member type[.](#2.sentence-3)