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std::unique_ptr::swap(3) C++ Standard Libary std::unique_ptr::swap(3)

NAME

std::unique_ptr::swap - std::unique_ptr::swap

Synopsis


void swap( unique_ptr& other ) noexcept; (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)

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...

2024.06.10 http://cppreference.com