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cppdraft/string/swap.md

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+[string.swap]
+
+# 27 Strings library [[strings]](./#strings)
+
+## 27.4 String classes [[string.classes]](string.classes#string.swap)
+
+### 27.4.3 Class template basic_string [[basic.string]](basic.string#string.swap)
+
+#### 27.4.3.7 Modifiers [[string.modifiers]](string.modifiers#string.swap)
+
+#### 27.4.3.7.8 basic_string​::​swap [string.swap]
+
+[🔗](#lib:swap,basic_string)
+
+`constexpr void swap(basic_string& s)
+  noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value ||
+           allocator_traits<Allocator>::is_always_equal::value);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L4263)
+
+*Preconditions*: allocator_traits<Allocator>​::​propagate_on_container_swap​::​value is true orget_allocator() == s.get_allocator()[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L4269)
+
+*Postconditions*: *this contains the same sequence of characters that was in s,s contains the same sequence of characters that was in*this[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L4276)
+
+*Throws*: Nothing[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L4280)
+
+*Complexity*: Constant time[.](#4.sentence-1)