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cppdraft/any/modifiers.md
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cppdraft/any/modifiers.md
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[any.modifiers]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.7 Storage for any type [[any]](any#modifiers)
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### 22.7.4 Class any [[any.class]](any.class#any.modifiers)
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#### 22.7.4.4 Modifiers [any.modifiers]
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[ð](#lib:emplace,any)
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`template<class T, class... Args>
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decay_t<T>& emplace(Args&&... args);
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7390)
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Let VT be decay_t<T>[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7393)
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*Constraints*: is_copy_constructible_v<VT> is true andis_constructible_v<VT, Args...> is true[.](#2.sentence-1)
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7398)
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*Preconditions*: VT meets the [*Cpp17CopyConstructible*](utility.arg.requirements#:Cpp17CopyConstructible "16.4.4.2 Template argument requirements [utility.arg.requirements]") requirements[.](#3.sentence-1)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7402)
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*Effects*: Calls reset()[.](#4.sentence-1)
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Then direct-non-list-initializes the contained value of type VT with std::forward<Args>(args)...[.](#4.sentence-2)
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[5](#5)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7408)
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*Postconditions*: *this contains a value[.](#5.sentence-1)
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[6](#6)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7412)
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*Returns*: A reference to the new contained value[.](#6.sentence-1)
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[7](#7)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7416)
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*Throws*: Any exception thrown by the selected constructor of VT[.](#7.sentence-1)
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[8](#8)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7420)
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*Remarks*: If an exception is thrown during the call to VT's constructor,*this does not contain a value, and any previously contained value
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has been destroyed[.](#8.sentence-1)
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[ð](#lib:emplace,any_)
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`template<class T, class U, class... Args>
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decay_t<T>& emplace(initializer_list<U> il, Args&&... args);
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`
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[9](#9)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7434)
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Let VT be decay_t<T>[.](#9.sentence-1)
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[10](#10)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7437)
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*Constraints*: is_copy_constructible_v<VT> is true andis_constructible_v<VT, initializer_list<U>&, Args...> is true[.](#10.sentence-1)
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[11](#11)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7442)
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*Preconditions*: VT meets the [*Cpp17CopyConstructible*](utility.arg.requirements#:Cpp17CopyConstructible "16.4.4.2 Template argument requirements [utility.arg.requirements]") requirements[.](#11.sentence-1)
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[12](#12)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7446)
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*Effects*: Calls reset()[.](#12.sentence-1)
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Then direct-non-list-initializes the contained value
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of type VT with il, std::forward<Args>(args)...[.](#12.sentence-2)
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[13](#13)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7451)
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*Postconditions*: *this contains a value[.](#13.sentence-1)
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[14](#14)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7455)
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*Returns*: A reference to the new contained value[.](#14.sentence-1)
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[15](#15)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7459)
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*Throws*: Any exception thrown by the selected constructor of VT[.](#15.sentence-1)
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[16](#16)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7463)
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*Remarks*: If an exception is thrown during the call to VT's constructor,*this does not contain a value, and any previously contained value
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has been destroyed[.](#16.sentence-1)
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[ð](#lib:reset,any)
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`void reset() noexcept;
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`
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[17](#17)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7476)
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*Effects*: If has_value() is true, destroys the contained value[.](#17.sentence-1)
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[18](#18)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7480)
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*Postconditions*: has_value() is false[.](#18.sentence-1)
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[ð](#lib:swap,any)
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`void swap(any& rhs) noexcept;
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`
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[19](#19)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7492)
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*Effects*: Exchanges the states of *this and rhs[.](#19.sentence-1)
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