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std::multiplies(3)	      C++ Standard Libary	    std::multiplies(3)

NAME
       std::multiplies - std::multiplies

Synopsis
	  Defined in header <functional>
	  template<>			  (since C++14)
	  class	multiplies<void>;

	  std::multiplies<void>	 is  a	specialization of std::multiplies with
       parameter and
	  return type deduced.

Member functions
	  operator() returns the product of two	arguments
		     (public member function)

       std::multiplies<void>::operator()

	  template< class T, class U >

	  constexpr auto operator()( T&& lhs, U&& rhs )	const

	      -> decltype(std::forward<T>(lhs) * std::forward<U>(rhs));

	  Returns the product of lhs and rhs.

Parameters
	  lhs, rhs - values to multiply

Return value
	  std::forward<T>(lhs) * std::forward<U>(rhs).

Example
       // Run this code

	#include <complex>
	#include <functional>
	#include <iostream>

	int main()
	{
	    auto complex_multiplies = std::multiplies<void>{}; // void can  be
       omitted
	    constexpr std::complex z1{1.0, 2.0}, z2{3.0, 4.0};

	    std::cout << std::showpos
		      << complex_multiplies(z1,	z2) << ' ' << z1 * z2 << '\n'
		      << complex_multiplies(z1,	5.) << ' ' << z1 * 5. << '\n'
		      << complex_multiplies(5.,	z1) << ' ' << 5. * z1 << '\n';
	}

Output:
	(-5,+10) (-5,+10)
	(+5,+10) (+5,+10)
	(+5,+10) (+5,+10)

http://cppreference.com		  2024.06.10		    std::multiplies(3)

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