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cppdraft/tuple/swap.md

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+[tuple.swap]
+
+# 22 General utilities library [[utilities]](./#utilities)
+
+## 22.4 Tuples [[tuple]](tuple#swap)
+
+### 22.4.4 Class template tuple [[tuple.tuple]](tuple.tuple#tuple.swap)
+
+#### 22.4.4.4 swap [tuple.swap]
+
+[🔗](#lib:swap,tuple)
+
+`constexpr void swap(tuple& rhs) noexcept(see below);
+constexpr void swap(const tuple& rhs) const noexcept(see below);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2532)
+
+Let i be in the range [0, sizeof...(Types)) in order[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2535)
+
+*Mandates*: 
+
+- [(2.1)](#2.1)
+
+  For the first overload,(is_swappable_v<Types> && ...) is true[.](#2.1.sentence-1)
+
+- [(2.2)](#2.2)
+
+  For the second overload,(is_swappable_v<const Types> && ...) is true[.](#2.2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2546)
+
+*Preconditions*: For all i, get<i>(*this) is swappable with ([[swappable.requirements]](swappable.requirements "16.4.4.3 Swappable requirements")) get<i>(rhs)[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2550)
+
+*Effects*: For each i, calls swap for get<i>(*this) and get<i>(rhs)[.](#4.sentence-1)
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2554)
+
+*Throws*: Nothing unless one of the element-wise swap calls throws an exception[.](#5.sentence-1)
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L2558)
+
+*Remarks*: The exception specification is equivalent to
+
+- [(6.1)](#6.1)
+
+(is_nothrow_swappable_v<Types> && ...) for the first overload and
+
+- [(6.2)](#6.2)
+
+(is_nothrow_swappable_v<const Types> && ...) for the second overload[.](#6.sentence-1)