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

C++ Functional Multiplies

It is a multiplication function object class and binary function object class whose call returns the result of multiplying its two arguments (as returned by operator *).

Following is the declaration for std::multiplies.

template <class T> struct multiplies;

template <class T> struct multiplies;

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::multiplies.

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

int main () {
   int numbers[9];
   int factorials[9];
   for (int i=0;i<9;i++) numbers[i]=i+1;
   std::partial_sum (numbers, numbers+9, factorials, std::multiplies<int>());
   for (int i=0; i<5; i++)
      std::cout << "factorial of " << numbers[i] << "! is " << factorials[i] << '\n';
   return 0;
}

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

factorial of 1! is 1
factorial of 2! is 2
factorial of 3! is 6
factorial of 4! is 24
factorial of 5! is 120

functional.htm

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