std::minus<void>
Defined in header <functional> | ||
|---|---|---|
template<> class minus<void>; | (since C++14) |
std::minus<void> is a specialization of std::minus with parameter and return type deduced.
Nested types
| Nested type | Definition |
|---|---|
is_transparent | unspecified |
Member functions
| operator() | 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));
|
Returns the difference of lhs and rhs.
Parameters
| lhs, rhs | - | values to subtract |
Return value
std::forward<T>(lhs) - std::forward<U>(rhs).
Example
#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)
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