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cppdraft/refwrap/const.md

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+[refwrap.const]
+
+# 22 General utilities library [[utilities]](./#utilities)
+
+## 22.10 Function objects [[function.objects]](function.objects#refwrap.const)
+
+### 22.10.6 Class template reference_wrapper [[refwrap]](refwrap#const)
+
+#### 22.10.6.2 Constructors [refwrap.const]
+
+[🔗](#lib:reference_wrapper,constructor)
+
+`template<class U>
+  constexpr reference_wrapper(U&& u) noexcept(see below);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11724)
+
+Let *FUN* denote the exposition-only functionsvoid *FUN*(T&) noexcept;void *FUN*(T&&) = delete;
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11731)
+
+*Constraints*: The expression *FUN*(declval<U>()) is well-formed andis_same_v<remove_cvref_t<U>, reference_wrapper> is false[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11736)
+
+*Effects*: Creates a variable r as if by T& r = std​::​forward<U>(u),
+then constructs a reference_wrapper object
+that stores a reference to r[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11743)
+
+*Remarks*: The exception specification is equivalent tonoexcept(*FUN*(declval<U>()))[.](#4.sentence-1)
+
+[🔗](#lib:reference_wrapper,constructor_)
+
+`constexpr reference_wrapper(const reference_wrapper& x) noexcept;
+`
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11755)
+
+*Effects*: Constructs a reference_wrapper object that
+stores a reference to x.get()[.](#5.sentence-1)