62 lines
1.7 KiB
Markdown
62 lines
1.7 KiB
Markdown
[refwrap.helpers]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.10 Function objects [[function.objects]](function.objects#refwrap.helpers)
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### 22.10.6 Class template reference_wrapper [[refwrap]](refwrap#helpers)
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#### 22.10.6.7 Helper functions [refwrap.helpers]
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11913)
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The template parameter T of
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the following ref and cref function templates
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may be an incomplete type[.](#1.sentence-1)
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[ð](#lib:ref,reference_wrapper)
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`template<class T> constexpr reference_wrapper<T> ref(T& t) noexcept;
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`
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11924)
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*Returns*: reference_wrapper<T>(t)[.](#2.sentence-1)
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[ð](#lib:ref,reference_wrapper_)
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`template<class T> constexpr reference_wrapper<T> ref(reference_wrapper<T> t) noexcept;
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`
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11935)
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*Returns*: t[.](#3.sentence-1)
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[ð](#lib:cref,reference_wrapper)
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`template<class T> constexpr reference_wrapper<const T> cref(const T& t) noexcept;
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`
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11946)
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*Returns*: reference_wrapper<const T>(t)[.](#4.sentence-1)
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[ð](#lib:cref,reference_wrapper_)
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`template<class T> constexpr reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;
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`
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[5](#5)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11957)
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*Returns*: t[.](#5.sentence-1)
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