std::minus<void>
From cppreference.com
| Defined in header <functional>
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template<> class minus<void>; |
(since C++14) | |
std::minus<void> is a specialization of std::minus with parameter and return type deduced.
Member types
| Type | Definition |
is_transparent
|
unspecified |
Member functions
| returns the difference of two arguments (public member function) |
std::minus<void>::operator()
template< class T, class U > constexpr auto operator()( T&& lhs, U&& rhs ) const -> decltype(std::forward<T>(lhs) - std::forward<U>(rhs)); |
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Returns the difference of lhs and rhs.
Parameters
| lhs, rhs | - | values to subtract |
Return value
std::forward<T>(lhs) - std::forward<U>(rhs).
Example
Run this code
#include <complex>
#include <functional>
#include <iostream>
int main()
{
auto complex_minus = std::minus<void>{}; // “void” can be omitted
constexpr std::complex<int> z(4, 2);
std::cout << complex_minus(z, 1) << '\n';
std::cout << (z - 1) << '\n';
}
Output:
(3,2)
(3,2)