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cppdraft/concepts/compare/general.md

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+[concepts.compare.general]
+
+# 18 Concepts library [[concepts]](./#concepts)
+
+## 18.5 Comparison concepts [[concepts.compare]](concepts.compare#general)
+
+### 18.5.1 General [concepts.compare.general]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/concepts.tex#L843)
+
+Subclause [[concepts.compare]](concepts.compare "18.5 Comparison concepts") describes concepts that establish relationships and orderings
+on values of possibly differing object types[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/concepts.tex#L847)
+
+Given an expression E and a type C,
+let *CONVERT_TO_LVALUE*<C>(E) be:
+
+- [(2.1)](#2.1)
+
+static_cast<const C&>(as_const(E)) if that is a valid expression, and
+
+- [(2.2)](#2.2)
+
+static_cast<const C&>(std​::​move(E)) otherwise[.](#2.sentence-1)