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cppdraft/library/class/props.md

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+[library.class.props]
+
+# 16 Library introduction [[library]](./#library)
+
+## 16.4 Library-wide requirements [[requirements]](requirements#library.class.props)
+
+### 16.4.6 Conforming implementations [[conforming]](conforming#library.class.props)
+
+#### 16.4.6.11 Properties of library classes [library.class.props]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3825)
+
+Unless explicitly stated otherwise, it is unspecified whether any class
+described in [[support]](support "17 Language support library") through [[exec]](exec "33 Execution control library") and[[depr]](depr "Annex D (normative) Compatibility features") is a trivially copyable class, a standard-layout class, or an
+implicit-lifetime class ([[class.prop]](class.prop "11.2 Properties of classes"))[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3831)
+
+Unless explicitly stated otherwise, it is unspecified whether any class for
+which trivial relocation (i.e., the effects oftrivially_relocate ([[obj.lifetime]](obj.lifetime "20.2.6 Explicit lifetime management"))) would be semantically equivalent
+to move-construction of the destination object followed by destruction of the
+source object is a trivially relocatable class ([[class.prop]](class.prop "11.2 Properties of classes"))[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3838)
+
+Unless explicitly stated otherwise, it is unspecified whether a class C is a replaceable class ([[class.prop]](class.prop "11.2 Properties of classes")) if assigning an xvalue a of
+type C to an object b of type C is semantically
+equivalent to destroying b and then constructing from a inb's place[.](#3.sentence-1)