std::unique_ptr::swap
From cppreference.com
< cpp | memory | unique ptr
| void swap(unique_ptr& other); |
(since C++11) | |
Swaps the managed objects and associated deleters of *this and another unique_ptr object other.
Parameters
| other | - | another unique_ptr object to swap the managed object and the deleter with |
Return value
(none)
Exceptions
noexcept specification:
noexcept
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 << std::endl; std::cout << "up2->val:" << up2->val << std::endl; }
Output:
Foo... Foo... up1->val:2 up2->val:1 ~Foo... ~Foo...