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std::is_final

STD：：是[医]最终

Defined in header ​​
template< class T > struct is_final;​(since C++14)

如果T是最后一个类%28，即用最终说明符%29，提供成员常量。value平等true.对于任何其他类型，value是false...

如果T是类类型，T应该是一个完整的类型；否则，该行为是未定义的。

模板参数

T-a type to check

辅助变量模板

template< class T > inline constexpr bool is_final_v = is_final::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a final class type , 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>

注记

最后类不能用作基类。

阿联合可以标记final28%和std::is_final将检测到%29，即使联合在任何情况下都不能用作基。

例

二次

#include <iostream>
#include <type_traits>
 
class A {};
class B final {};
 
int main() 
{
    std::cout
        << std::boolalpha
        << std::is_final<A>::value << '\n'
        << std::is_final<B>::value << '\n';
}

二次

产出：

二次

false
true

二次

另见

is_class (C++11)checks if a type is a non-union class type (class template)
is_polymorphic (C++11)checks if a type is polymorphic class type (class template)

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/type/is[医]最终

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