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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 with another unique_ptr object other.

Contents

[edit] Parameters

other - another unique_ptr object to swap the managed object and the deleter with

[edit] Return value

(none)

[edit] Exceptions

noexcept specification:  
noexcept
  

[edit] Example

#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...