std::bad_exception

 

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std::bad_exception

Member functions

bad_exception::bad_exception

bad_exception::operator=

bad_exception::what

 

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

All member functions of std::bad_exception are constexpr.

(since C++26)

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)

Notes

Feature-test macro	Value	Std	Feature
__cpp_lib_constexpr_exceptions	202411L	(C++26)	constexpr for exception types

Example

Compiles only in C++14 or earlier modes (may issue warnings).

Run this code

#include <exception>#include <iostream>#include <stdexcept>   void my_unexp(){throw;}   void test()throw(std::bad_exception)// Dynamic exception specifications// are deprecated in C++11{throwstd::runtime_error("test");}   int main(){std::set_unexpected(my_unexp);// Deprecated in C++11, removed in C++17   try{ test();}catch(const std::bad_exception& e){std::cerr<<"Caught "<< e.what()<<'\n';}}

Possible output:

Caught std::bad_exception