std::multiplies<void>

Since C++14

Header: <functional>

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

# Declarations

template<>
class multiplies<void>;

(since C++14)

# Parameters

# Return value

std::forward(lhs) * std::forward(rhs).

# Example

#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';
}