std::experimental::negation
From cppreference.com
< cpp | experimental
| Defined in header <experimental/type_traits>
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| template<class B> struct negation; |
(1) | (library fundamentals TS v2) |
Forms the logical negation of the type trait B.
The type negation<B> is a UnaryTypeTrait with a BaseCharacteristic of std::integral_constant<bool, !bool(B::value)>.
Template parameters
| B | - | any type such that the expression bool(B::value) is a valid constant expression |
Helper variable template
| template<class B> constexpr bool negation_v = negation<B>::value; |
(library fundamentals TS v2) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if B has a member ::value such that !bool(B::value) is true , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
| operator() (C++14) |
returns value (public member function) |
Member types
| Type | Definition |
value_type
|
bool
|
type
|
std::integral_constant<bool, value> |
Possible implementation
template<class B> struct negation : std::integral_constant<bool, !bool(B::value)> { }; |
Example
| This section is incomplete Reason: no example |
See also
| (C++17) |
logical NOT metafunction (class template) |