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

C++ Functional Programming Features

It is an addition function object class and binary function object class whose call returns the result of adding its two arguments (as returned by operator +).

Following is the declaration for std::plus.

template <class T> struct plus;

template <class T> struct plus;

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::plus.

#include <iostream>
#include <functional>
#include <algorithm>

int main () {
   int first[]={15,12,30,45,15};
   int second[]={10,20,30,40,50};
   int results[5];
   std::transform (first, first+5, second, results, std::plus<int>());
   for (int i=0; i<5; i++)
      std::cout << results[i] << ' ';
   std::cout << '\n';
   return 0;
}

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

25 32 60 85 65 

functional.htm

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