std::unique_ptr<T,Deleter>::swap
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std::unique_ptr
unique_ptr::swap
(C++14)(C++20)
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(C++20)
void swap( unique_ptr& other ) noexcept;
(since C++11)
Swaps the managed objects and associated deleters of *this and another unique_ptr object other.
[edit] Parameters
other
-
another unique_ptr object to swap the managed object and the deleter with
[edit] Return value
(none)
[edit] Example
Run this code
#include <iostream> #include <memory> struct Foo { Foo(int _val) : val(_val) { std::cout << "Foo...\n"; } ~Foo() { std::cout << "~Foo...\n"; } int val; }; int main() { std::unique_ptr <Foo> up1(new Foo(1)); std::unique_ptr <Foo> up2(new Foo(2)); up1.swap(up2); std::cout << "up1->val:" << up1->val << '\n'; std::cout << "up2->val:" << up2->val << '\n'; }
Output:
Foo... Foo... up1->val:2 up2->val:1 ~Foo... ~Foo...