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cppdraft/allocator/requirements/completeness.md

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+[allocator.requirements.completeness]
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+# 16 Library introduction [[library]](./#library)
+
+## 16.4 Library-wide requirements [[requirements]](requirements#allocator.requirements.completeness)
+
+### 16.4.4 Requirements on types and expressions [[utility.requirements]](utility.requirements#allocator.requirements.completeness)
+
+#### 16.4.4.6 *Cpp17Allocator* requirements [[allocator.requirements]](allocator.requirements#completeness)
+
+#### 16.4.4.6.2 Allocator completeness requirements [allocator.requirements.completeness]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L2964)
+
+If X is an allocator class for type T,X additionally meets the allocator completeness requirements if,
+whether or not T is a complete type:
+
+- [(1.1)](#1.1)
+
+X is a complete type, and
+
+- [(1.2)](#1.2)
+
+all the member types of [allocator_traits<X>](allocator.traits "20.2.9 Allocator traits [allocator.traits]") other than value_type are complete types[.](#1.sentence-1)