void swap( unique_ptr& other ) noexcept; | (since C++11) |
Swaps the managed objects and associated deleters of *this and another unique_ptr object other.
| other | - | another unique_ptr object to swap the managed object and the deleter with |
(none).
#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...
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https://en.cppreference.com/w/cpp/memory/unique_ptr/swap