You can only specify one type per on xxx catch(e) { line or alternatively use catch(e) to catch all (remaining – see below) exception types. The type after on is used as type for the parameter to catch(e). Having a set of types for this parameter wouldn’t work out well. try { … } on … Read more
Functions can throw anything, even things that aren’t an Exception: void foo() { throw 42; } But the on Exception clause means that you are specifically catching only subclass of Exception. As such, in the following code: try { throw 42; } on Exception catch (_) { print(‘never reached’); } the on Exception will never … Read more
If you have multiple exception types, and assuming there’s a hierarchy of exceptions (and all derived publicly from some subclass of std::exception,) start from the most specific and continue to more general: try { // throws something } catch ( const MostSpecificException& e ) { // handle custom exception } catch ( const LessSpecificException& e … Read more
If you want, you can add throws clauses to your methods. Then you don’t have to catch checked methods right away. That way, you can catch the exceptions later (perhaps at the same time as other exceptions). The code looks like: public void someMethode() throws SomeCheckedException { // code } Then later you can deal … Read more
Edit Typescript 4.0 added the ability to specify unknown and any on catch variables (Issue) And typescript 4.4 added the ability to make unknown the default on catch variables (PR) uning the useUnknownInCatchVariables flag. With this flag the following is now possible: catch(e){ result = e.message; // error under useUnknownInCatchVariables if (typeof e === “string”) … Read more
traceback.format_exc() or sys.exc_info() will yield more info if that’s what you want. import traceback import sys try: do_stuff() except Exception: print(traceback.format_exc()) # or print(sys.exc_info()[2])
The First Syntax: The scope of the try block starts after the Member Initialization list has been completed, So any exception thrown during Member Initialization will not be caught by this try-catch block. The second syntax: It ensures that if an exception gets thrown during Member Initialization list then you are able to catch the … Read more
If you don’t need to adjust the exception type, you rethrow (throw further) the same instance without any changes: catch (IOException e) { throw e; } If you do need to adjust the exception type, you wrap e (as a cause) into a new exception of the type required. catch (IOException e) { throw new … Read more
The ExceptionUtils#getRootCause() method can come in very handy in such situations.
Using except by itself will catch any exception short of a segfault. try: something() except: fallback() You might want to handle KeyboardInterrupt separately in case you need to use it to exit your script: try: something() except KeyboardInterrupt: return except: fallback() There’s a nice list of basic exceptions you can catch here. I also quite … Read more