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std::negation

STD：否定

Defined in header ​​
template<class B> struct negation;(1)(since C++17)

形成类型特征的逻辑否定B...

类型std::negation<B>是UnaryTypeTrait基本特征std::bool_constant<!bool(B::value)>...

模板参数

B-any type such that B::value is convertible to bool

辅助变量模板

template inline constexpr bool negation_v = negation::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if B has a member ::value that is false when explicitly converted to bool , false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

可能的实施

模板<class B>结构否定：STD：：Bool[医]常数<%21B：：value>{}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
static_assert(
    std::is_same<
        std::bool_constant<false>,
        typename std::negation<std::bool_constant<true>>::type>::value,
    ""
static_assert(
    std::is_same<
        std::bool_constant<true>,
        typename std::negation<std::bool_constant<false>>::type>::value,
    ""
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::negation<std::bool_constant<true>>::value << '\n';
    std::cout << std::negation<std::bool_constant<false>>::value << '\n';
}

二次

产出：

二次

false
true

二次

另见

conjunction (C++17)variadic logical AND metafunction (class template)
disjunction (C++17)variadic logical OR metafunction (class template)
integral_constantbool_constant (C++11)(C++17)compile-time constant of specified type with specified value (class template)

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