boost::algorithm::one_of_equal() in C++ library

The one_of_equal() function in C++ boost library is found under the header ‘boost/algorithm/cxx11/one_of.hpp’ which tests if exactly one of the elements of a sequence against the value passed is same. It takes a sequence and a value, and returns true if the exactly one of the elements are same in the sequence to the value passed.

Syntax:

bool one_of_equal ( InputIterator first, InputIterator last, const &value)
or
bool one_of_equal ( const Range &R, const &value)



Parameters: The function accepts parameters as described below:

  • first: It specifies the input iterators to the initial positions in a sequence.
  • second: It specifies the input iterators to the final positions in a sequence.
  • value: It specifies a value which is to be checked against for one the elements of the sequence.
  • R: It is the complete sequence.

Return Value: The function returns true if exactly one of the elements of the sequence is equal to value, else it returns false.

Below is the implementation of the above approach:

Program-1:

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// C++ program to implement the
// above mentioned function
  
#include <bits/stdc++.h>
#include <boost/algorithm/cxx11/one_of.hpp>
using namespace std;
  
// Drivers code
int main()
{
  
    // Declares the sequence with
    int c[] = { 1, 2, 3 };
  
    // Run the function
    bool ans = boost::algorithm::one_of_equal(c, 1);
  
    // Condition to check
    if (ans == 1)
        cout << "exactly one element is 1";
    else
        cout << "exactly one element is not 1";
    return 0;
}

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Output:

exactly one element is 1

Program-2:

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// C++ program to implement the
// above mentioned function
  
#include <bits/stdc++.h>
#include <boost/algorithm/cxx11/one_of.hpp>
using namespace std;
  
// Drivers code
int main()
{
  
    // Declares the sequence
    int a[] = { 1, 2, 3, 6 };
  
    // Run the function
    bool ans
        = boost::algorithm::one_of_equal(a, a + 4, 4);
  
    // Condition to check
    if (ans == 1)
        cout << "exactly one element is 4";
    else
        cout << "exactly one element is not 4";
    return 0;
}

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Output:

exactly one element is not 4

Reference: https://www.boost.org/doc/libs/1_70_0/libs/algorithm/doc/html/the_boost_algorithm_library/CXX11/one_of.html



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