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std::bad_exception

Defined in header `<exception>`
class bad_exception;

std::bad_exception is the type of the exception thrown by the C++ runtime in the following situations:

If `std::exception_ptr` stores a copy of the caught exception and if the copy constructor of the exception object caught by `std::current_exception` throws an exception, the captured exception is an instance of `std::bad_exception`.	(since C++11)
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)

Inheritance diagram.

Member functions

(constructor)	constructs the `bad_exception` object (public member function)
operator=	copies the object (public member function)
what [virtual]	returns the explanatory string (virtual public member function)

Inherited from std::exception

Member functions

(destructor) [virtual]	destroys the exception object (virtual public member function of `std::exception`)
what [virtual]	returns an explanatory string (virtual public member function of `std::exception`)

Example

#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';
    }
}

Possible output:

Caught std::bad_exception

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