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cppdraft/derivation.md

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+[derivation]
+
+# 16 Library introduction [[library]](./#library)
+
+## 16.4 Library-wide requirements [[requirements]](requirements#derivation)
+
+### 16.4.6 Conforming implementations [[conforming]](conforming#derivation)
+
+#### 16.4.6.13 Derived classes [derivation]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3856)
+
+An implementation may derive any class in the C++ standard library from a class with a
+name reserved to the implementation[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3862)
+
+Certain classes defined in the C++ standard library are required to be derived from
+other classes
+in the C++ standard library[.](#2.sentence-1)
+
+An implementation may derive such a class directly from the required base or indirectly
+through a hierarchy of base classes with names reserved to the implementation[.](#2.sentence-2)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3870)
+
+In any case:
+
+- [(3.1)](#3.1)
+
+Every base class described asvirtual shall be virtual;
+
+- [(3.2)](#3.2)
+
+Every base class not specified asvirtual shall not be virtual;
+
+- [(3.3)](#3.3)
+
+Unless explicitly stated otherwise, types with distinct names shall be distinct
+types[.](#3.sentence-1)
+  [*Note [1](#note-1)*:
+  There is an implicit exception to this rule for types that are
+described as synonyms ([[dcl.typedef]](dcl.typedef "9.2.4 The typedef specifier"), [[namespace.udecl]](namespace.udecl "9.10 The using declaration")), such assize_t ([[support.types]](support.types "17.2 Common definitions")) andstreamoff ([[stream.types]](stream.types "31.2.2 Types"))[.](#3.3.sentence-2)
+ — *end note*]
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3892)
+
+All types specified in the C++ standard library shall be non-final types
+unless otherwise specified[.](#4.sentence-1)