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std::bad_typeid

STD：不好[医]类型

Defined in header ​​
class bad_typeid : public std::exception;​​

对象时引发此类型的异常。typeid运算符应用于多态类型的取消引用的空指针值。

二次

二次

继承图

成员函数

(constructor)constructs a new bad_typeid object (public member function)

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

例

二次

#include <iostream>
#include <typeinfo>
 
struct S { // The type has to be polymorphic
    virtual void f(
}; 
 
int main()
{
    S* p = nullptr;
    try {
        std::cout << typeid(*p).name() << '\n';
    } catch(const std::bad_typeid& e) {
        std::cout << e.what() << '\n';
    }
}

二次

产出：

二次

Attempted a typeid of NULL pointer!

二次

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