std::unique_ptr<T,Deleter>:: swap

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Dynamic memory management
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Allocators
Garbage collection support
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)



std::unique_ptr
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...
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