std::multiplies<void>
Defined in header <functional> | ||
|---|---|---|
template<> class multiplies<void>; | (since C++14) |
std::multiplies<void> is a specialization of std::multiplies with parameter and return type deduced.
Nested types
| Nested type | Definition |
|---|---|
is_transparent | unspecified |
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
#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)
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