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How to use the is_partitioned() function in C++

Vinisha Maheshwari

The is_partitioned() function is present in the < algorithm > library. This function is used to check whether the elements of the container are partitioned on the basis of the function passed in the argument or not.

Syntax

bool is_partitioned(Iterator Begin, Iterator End, Pred);

Parameters

The is_partitioned() function takes the following parameters:

  • Begin: A bidirectional iterator pointing to the first element in the range.
  • End: A bidirectional iterator pointing to the last element in the range.
  • Pred: A user-defined function that defines the condition on the basis of which the check for the elements partitioned is performed.

Return value

The function returns a Boolean value:

  • True: If the elements of the container are partitioned on the basis of the function passed in the argument.
  • False: If the elements of the container are not partitioned on the basis of the function passed in the argument.

Code

Let us look at the code snippet below.

#include <iostream>
#include <algorithm>
using namespace std;
bool mul3(int x)
{
return (x % 3);
}
int main()
{
int arr[] = { 3, 21, 110, 15, 32, 65, 34, 57 };


partition(arr, arr + 8, mul3);


if(is_partitioned(arr, arr + 8, mul3))
cout<< "Array is partitioned \n";
else
cout<< "Array is not partitioned \n";
return 0;
}
Using is_partitioned() function in C++

Explanation

  • In lines 1 and 2, we imported the required libraries.

  • In lines 4 to 6, we defined a function to check whether the element in the range is multiple of 3 or not.

  • In line 8, we made a main function.

  • In line 10, we initialized an array.

  • In line 12, we used the partition() function to partition the elements which are not multiples of 3 and elements which are multiples of 3.

  • In lines 14 to 17, we used an if-else statement to display the result message of the is_partitioned() function which has the same function in argument as the partition() function.

In this way, we can use is_partitioned() function in C++.

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