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Showing content from https://cplusplus.com/reference/functional/bit_and/ below:

class template

<functional>

template <class T> struct bit_and;

Bitwise AND function object class

Generically, function objects are instances of a class with member function operator() defined. This member function allows the object to be used with the same syntax as a function call.

It is defined with the same behavior as:

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template <class T> struct bit_and {
  T operator() (const T& x, const T& y) const {return x&y;}
  typedef T first_argument_type;
  typedef T second_argument_type;
  typedef T result_type;
};

T

Type of the arguments and return type of the functional call.
The type shall support the operation (operator&).

T operator() (const T& x, const T& y)

Member function returning the bitwise "and" of its arguments (x&y).

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// bit_and example
#include <iostream>     // std::cout
#include <functional>   // std::bit_and
#include <algorithm>    // std::transform
#include <iterator>     // std::end


int main () {
  int values[] = {100,200,300,400,500};
  int masks[] = {0xf,0xf,0xf,255,255};
  int results[5];

  std::transform (values, std::end(values), masks, results, std::bit_and<int>());

  std::cout << "results:";
  for (const int& x: results)
    std::cout << ' ' << x;
  std::cout << '\n';

  return 0;
}

bit_or

Bitwise OR function object class (class template)

bit_xor

Bitwise XOR function object class (class template)

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