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cppdraft/polymorphic/obs.md

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+[polymorphic.obs]
+
+# 20 Memory management library [[mem]](./#mem)
+
+## 20.4 Types for composite class design [[mem.composite.types]](mem.composite.types#polymorphic.obs)
+
+### 20.4.2 Class template polymorphic [[polymorphic]](polymorphic#obs)
+
+#### 20.4.2.6 Observers [polymorphic.obs]
+
+[🔗](#lib:operator*,polymorphic)
+
+`constexpr const T& operator*() const noexcept;
+constexpr T& operator*() noexcept;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7355)
+
+*Preconditions*: *this is not valueless[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7359)
+
+*Returns*: A reference to the owned object[.](#2.sentence-1)
+
+[🔗](#lib:operator-%3e,polymorphic)
+
+`constexpr const_pointer operator->() const noexcept;
+constexpr pointer operator->() noexcept;
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7371)
+
+*Preconditions*: *this is not valueless[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7375)
+
+*Returns*: A pointer to the owned object[.](#4.sentence-1)
+
+[🔗](#lib:valueless_after_move,polymorphic)
+
+`constexpr bool valueless_after_move() const noexcept;
+`
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7386)
+
+*Returns*: true if *this is valueless, otherwise false[.](#5.sentence-1)
+
+[🔗](#lib:get_allocator,polymorphic)
+
+`constexpr allocator_type get_allocator() const noexcept;
+`
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7397)
+
+*Returns*: *alloc*[.](#6.sentence-1)