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