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std::bad_exception

STD：不好[医]例外

Defined in header ​​
class bad_exception;​​

std::bad_exception是C++运行时在以下情况下引发的异常的类型：

1%29std::exception_ptr存储捕获异常的副本，如果异常对象的副本构造函数被std::current_exception引发异常，则捕获的异常是std::bad_exception...

2) If a dynamic exception specification is violated and std::unexpected throws or rethrows an exception that still violates the exception specification, but the exception specification allows std::bad_exception, std::bad_exception is thrown.(until C++17)

二次

二次

继承图

成员函数

(constructor)constructs the bad_exception object (public member function)
operator=copies the object (public member function)
what virtualreturns the explanatory string (virtual 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 <exception>
#include <stdexcept>
 
void my_unexp() { throw; }
 
void test() throw(std::bad_exception)
{
    throw std::runtime_error("test"
}
 
int main()
{
    std::set_unexpected(my_unexp
    try {
         test(
    } catch(const std::bad_exception& e)
    {
        std::cerr << "Caught " << e.what() << '\n';
    }
}

二次

产出：

二次

Caught std::bad_exception

二次

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