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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_functional_bit_or.htm below:

C++ Bitwise OR Function

It is a bitwise OR function object class and binary function object class whose call returns the result of applying the bitwise "or" operation between its two arguments (as returned by operator |).

Following is the declaration for std::bit_or.

template <class T> struct bit_or;

template <class T> struct bit_or;

T − It is a type of the arguments and return type of the functional call.

none

noexcep − It doesn't throw any exceptions.

In below example explains about std::bit_or.

#include <iostream>     
#include <functional>   
#include <numeric>      
#include <iterator>     

int main () {
   int flags[] = {10,20,40,80,160,320,640,1280};
   int acc = std::accumulate (flags, std::end(flags), 0, std::bit_or<int>());
   std::cout << "accumulated: " << acc << '\n';
   return 0;
}

Let us compile and run the above program, this will produce the following result −

accumulated: 2046     

functional.htm

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