std::unique_ptr<T,Deleter>::swap (3) - Linux Manuals

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

NAME

std::unique_ptr<T,Deleter>::swap - std::unique_ptr<T,Deleter>::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 << std::endl;
      std::cout << "up2->val:" << up2->val << std::endl;
  }

Output:

  Foo...
  Foo...
  up1->val:2
  up2->val:1
  ~Foo...
  ~Foo...