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:

1) 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.

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)

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

Run this code

#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';
    }
}

Output:

Caught std::bad_exception

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library (C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)
Filesystem library (C++17)
Technical Specifications

Member functions
bad_exception::bad_exception
bad_exception::operator=
bad_exception::what