CException is the base type of all exceptions thrown by VC++, so it should catch all the exceptions, right?
CException is the base type of all exceptions thrown by VC++, so it should
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CException is the base type of all exceptions thrown by VC++, so it should catch all the exceptions, right?
CExceptionis not the base type for all extensions (it might be the base type of all exceptions that MFC code uses, but that’s as far as it goes).In C++, you can throw anything; it doesn’t have to be an “exception” subclass, and it does not even have to be an object. It’s perfectly legal for example to write
throw 42;orthrow new std::vector<string>();The difference is then obvious:
catch(CException)will catch only thrown instances ofCExceptionand its subclasses, while the other will catch anything.