std::experimental::negation
From cppreference.com
< cpp | experimental
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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 base characteristic of std::integral_constant < bool, ! bool (B:: value ) >
Template parameters
| B | - | any type such that the expression bool(B::value) |
Helper variable template
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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
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bool |
type
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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
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(C++17)
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logical NOT metafunction (class template) |