std::bad_exception
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std::bad_exception
Defined in header
<exception>
class bad_exception : public 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.
- 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_exceptionis thrown.
std-bad exception-inheritance.svg
Inheritance diagram
All member functions of std::bad_exception are constexpr.
Contents
[edit] Member functions
Inherited from std::exception
Member functions
[edit] Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_constexpr_exceptions |
202411L |
(C++26) | constexpr for exception types |
[edit] 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 { throw std::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