std::unique_ptr::swap

1	`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

#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...

Links:

http://en.cppreference.com/w/cpp/memory/unique_ptr/swap

doc_CPP

2025-01-10 15:47:30

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