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cppdraft/utility/exchange.md

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+[utility.exchange]
+
+# 22 General utilities library [[utilities]](./#utilities)
+
+## 22.2 Utility components [[utility]](utility#exchange)
+
+### 22.2.3 exchange [utility.exchange]
+
+[🔗](#lib:exchange)
+
+`template<class T, class U = T>
+  constexpr T exchange(T& obj, U&& new_val) noexcept(see below);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L308)
+
+*Effects*: Equivalent to:T old_val = std::move(obj);
+obj = std::forward<U>(new_val);return old_val;
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L317)
+
+*Remarks*: The exception specification is equivalent to:is_nothrow_move_constructible_v<T> && is_nothrow_assignable_v<T&, U>