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)
cpp/error/exceptionstd-bad exception-inheritance.svg

Inheritance diagram.

Member functions

constructs the bad_exception object
(public member function)
copies the object
(public member function)
returns the explanatory string
(virtual public member function)

Inherited from std::exception

Member functions

destructs the exception object
(virtual public member function of std::exception)
returns an explanatory string
(virtual public member function of std::exception)


#include <iostream>
#include <exception>
#include <stdexcept>
void my_unexp() { throw; }
void test() throw(std::bad_exception)
    throw std::runtime_error("test");
int main()
    try {
    } catch(const std::bad_exception& e)
        std::cerr << "Caught " << e.what() << '\n';


Caught std::bad_exception

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