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valarray swap() function in c++
  • Last Updated : 23 Oct, 2018

The swap() function is defined in valarray header file. This function is used to swap the content of one valarray with another valarray.

Syntax:

void swap( valarray& valarray2 );

Parameter: This method accepts a parameter valarray2 which represents the another valarray with which we have to swap the old one.

Returns: This function doesn’t returns anything.

Below programs illustrate the above function:



Example 1:-




// C++ program to demonstrate
// example of swap() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    // Initializing 1st valarray
    valarray<int> varr1 = { 12, 24, 36, 48 };
  
    // Initializing 2nd valarray
    valarray<int> varr2 = { 20, 40, 60, 80 };
  
    varr1.swap(varr2);
  
    // Displaying valarrays after swapping
    cout << "The contents of 1st valarray "
            "after swapping are : ";
  
    for (int& x : varr1)
        cout << x << " ";
  
    cout << endl;
  
    cout << "The contents of 2nd valarray "
            "after swapping are : ";
  
    for (int& x : varr2)
        cout << x << " ";
  
    cout << endl;
  
    return 0;
}


Output:

The contents of 1st valarray after swapping are : 20 40 60 80 
The contents of 2nd valarray after swapping are : 12 24 36 48

Example 2:-




// C++ program to demonstrate
// example of swap() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    // Initializing 1st valarray
    valarray<int> varr1 = { -12, -24, -36, -48 };
  
    // Initializing 2nd valarray
    valarray<int> varr2 = { 20, 40, 60, 80 };
  
    varr1.swap(varr2);
  
    // Displaying valarrays after swapping
    cout << "The contents of 1st valarray "
            "after swapping are : ";
  
    for (int& x : varr1)
        cout << x << " ";
  
    cout << endl;
  
    cout << "The contents of 2nd valarray "
            "after swapping are : ";
  
    for (int& x : varr2)
        cout << x << " ";
  
    cout << endl;
  
    return 0;
}


Output:

The contents of 1st valarray after swapping are : 20 40 60 80 
The contents of 2nd valarray after swapping are : -12 -24 -36 -48

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