std::negate<void>
From cppreference.com
< cpp | utility | functional
Defined in header <functional>
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template<> class negate<void>; |
(since C++14) | |
std::negate<> is a specialization of std::negate with parameter and return type deduced.
Contents |
[edit] Member types
Type | Definition |
is_transparent
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unspecified |
[edit] Member functions
operator() |
returns its negated argument (public member function) |
std::negate<void>::operator()
template< class T > constexpr auto operator()( T&& arg ) const |
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Returns the result of negating arg.
Parameters
arg | - | value to negate |
Return value
-std::forward<T>(arg).
[edit] Example
Run this code
#include <complex> #include <functional> #include <iostream> int main() { auto complex_negate = std::negate<void>{}; // “void” can be omitted constexpr std::complex z(4, 2); std::cout << z << '\n'; std::cout << -z << '\n'; std::cout << complex_negate(z) << '\n'; }
Output:
(4,2) (-4,-2) (-4,-2)