C++ .swap()

In C++, the .swap() function swaps the values of two queues. The queues must have the same data type, although size can differ.

Syntax

The .swap() method can be used with the following syntax:

queue1.swap(queue2);

Or alternatively:

swap(queue1, queue2);

Parameters:

• queue2: The other queue whose contents are to be swapped.

Return value:

.swap() does not return a value.

Example

This example demonstrates the usage of the .swap() method with string queues:

#include <iostream>
#include <queue>
using namespace std;

int main() {
  // Declare queues
  queue<string> hello;
  queue<string> world;

  // Populate queues
  hello.push("hello");
  world.push("world");

  // Swap the values of the queues
  hello.swap(world);

  // Print queue values
  cout << hello.front() << " " << world.front();
}

Copy to clipboard
Copy to clipboard

The expected output would be:

world hello

Codebyte Example

The following codebyte example below uses .swap() on two integer queues:

Visit us
Visit us
Hide code
Code
Output
Hide output
Loading...
Copy to your clipboard
Copy Codebyte
Run