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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