Exception type loss

Hi folks, I'm using some code which catches exceptions thrown from signals, like shown here: http://blog.ale-re.net/2007/04/exception-handling.html.

Now, I'm having some problems: I have a chain of catch blocks for different exception types, but the exception returned is always caught as a generic std::exception, even though it is most definitely of more specific type. Here's some of the code:

Code:

---

try {
            return QApplication::notify(receiver, event);
        }
        catch (Xmms::connection_error &ex) {
            qDebug("Caught connection_error: %s",ex.what());
            return false;
        }
        catch (Xmms::result_error &ex) {
            qDebug("Caught result_error: %s",ex.what());
            return false;
        }
        catch (std::exception &ex) {
                qDebug("Caught generic exception: %s",ex.what());
        }
        catch (...) {
            qDebug("Unknown exception!");
            abort();
        }

---

The type of exception thrown IS the more specific type, but is, for some reason, caught in the less specific handler.

Is this a problem with Qt, or am I just mangling C++?

Thanks very much for your help.

Hi

It would help to see more source. My only guess from what I see is that you forward declared the classes Xmms::connection_error and Xmms::result_error in the header file and did not include the respective headers in the source file.

Sorry if you already have the answer and this is wrong.

Quote:

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Originally Posted by geordiejones

Hi

It would help to see more source. My only guess from what I see is that you forward declared the classes Xmms::connection_error and Xmms::result_error in the header file and did not include the respective headers in the source file.

Sorry if you already have the answer and this is wrong.

---

No, that can't be it. It would have caused a compile error.

Perhaps Qt was built without exception support which would lead to qmake passing -fno-exceptions?