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

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

Syntax:

bool any_of_equal ( InputIterator first, InputIterator last, const &value)
or
bool any_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 any the elements of the sequence.
R: It is the complete sequence.

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

Below is the implementation of the above approach:

Program-1:

// C++ program to implement the 
// above mentioned function 
  
#include <bits/stdc++.h> 
#include <boost/algorithm/cxx11/any_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::any_of_equal(c, 1); 
  
    // Condition to check 
    if (ans == 1) 
        cout << "at least one elements is 1"; 
    else
        cout << "all elements are not 1"; 
    return 0; 
} 

Output:

at least one elements is 1

Program-2:

// C++ program to implement the 
// above mentioned function 
  
#include <bits/stdc++.h> 
#include <boost/algorithm/cxx11/any_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::any_of_equal(a, a + 4, 4); 
  
    // Condition to check 
    if (ans == 1) 
        cout << "at least one element is 4"; 
    else
        cout << "all elements are not 4"; 
    return 0; 
} 

Output:

all elements are not 4

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

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