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std::bad_cast

STD：不好[医]铸造

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

对象时引发此类型的异常。dynamic_cast对于引用类型，运行时检查%28e.g失败。因为类型与继承%29无关，而且std::use_facet如果请求的方面不存在于区域设置中。

二次

二次

继承图

成员函数

(constructor)constructs a new bad_cast 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 Foo { virtual ~Foo() {} };
struct Bar { virtual ~Bar() {} };
 
int main()
{
    Bar b;
    try {
        Foo& f = dynamic_cast<Foo&>(b
    } catch(const std::bad_cast& e)
    {
        std::cout << e.what() << '\n';
    }
}

二次

可能的产出：

二次

Bad dynamic cast

二次

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