Defined in header <experimental/type_traits>
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

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)
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)> { };


See also

logical NOT metafunction
(class template)