logical_and in C++

logical_and in C++ is a binary function object class which returns the result of the logical “and” operation between its two arguments (as returned by operator &&).

Syntax:

template  struct logical_and : binary_function 
 {
  T operator() (const T& a, const T& b) const {return a&b&}
};

Parameters: (T)Type of the arguments and the return type of the function call.

Member types:

• a: Type of the first argument in member operator()
• b: Type of the second argument in member operator()
• result_type: Type returned by member operator()

Below is the program to implement logical_and using std::transform():

#include <bits/stdc++.h>
using namespace std;

int main()
{
    bool z[] = { true, false, true, false, true };
    bool y[] = { true, true, false, false, true };
    int n = 5;
    bool result[n];

    // using transform to
    // perform logical_AND on two array
    transform(z, z + n, y, result,
              logical_and<bool>());

    cout << "Logical AND:\n";
    for (int i = 0; i < n; i++)
        cout << z[i] << " AND " << y[i]
             << " = " << result[i] << "\n";
    return 0;
}

Output:

Logical AND:
1 AND 1 = 1
0 AND 1 = 0
1 AND 0 = 0
0 AND 0 = 0
1 AND 1 = 1