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:
// 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;
} |
exactly one element is 1
Program-2:
// 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;
} |
exactly one element is not 4