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std::has_virtual_destructor

STD：：HAS[医]虚拟[医]破坏者

Defined in header ​​
template< class T > struct has_virtual_destructor;​(since C++11)

如果T是具有虚拟析构函数的类型，提供成员常量。value平等true.对于任何其他类型，value是false...

如果T是非工会类类型，T应该是一个完整的类型；否则，该行为是未定义的。

辅助变量模板

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

继承自STD：积分[医]常量

成员常数

value statictrue if T has a virtual destructor , 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

如果类具有公共虚拟析构函数，则可以从它派生，并且可以通过指向基对象%28的指针安全地删除派生对象。GotW#1829%。

例

二次

#include <iostream>
#include <type_traits>
#include <string>
#include <stdexcept>
 
int main()
{
    std::cout << std::boolalpha
              << "std::string has a virtual destructor? "
              << std::has_virtual_destructor<std::string>::value << '\n'
              << "std::runtime_error has a virtual destructor? "
              << std::has_virtual_destructor<std::runtime_error>::value << '\n';
}

二次

产出：

二次

std::string has a virtual destructor? false
std::runtime_error has a virtual destructor? true

二次

另见

is_destructibleis_trivially_destructibleis_nothrow_destructible (C++11)(C++11)(C++11)checks if a type has a non-deleted destructor (class template)

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http：//en.cppreference.com/w/cpp/type/had[医]虚拟[医]破坏者

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