C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Is throwing an exception in a handler legal?          C++Talk.NET Forum Index -> C++ Language (Moderated) View previous topic :: View next topic   Author Message Gianluca Silvestri Guest Posted: Thu Feb 23, 2006 1:06 am    Post subject: Is throwing an exception in a handler legal? Hi all, Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. But now I cannot find any reference in the Standard or even on TCPPL supporting thi claim. Is it true? If so, what are the references? Thanks Gianluca Silvestri [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Bob Bell Guest Posted: Thu Feb 23, 2006 11:06 am    Post subject: Re: Is throwing an exception in a handler legal? Gianluca Silvestri wrote: Quote: Hi all, Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. But now I cannot find any reference in the Standard or even on TCPPL supporting thi claim. Is it true? If so, what are the references? It's not true. You can throw anything you want from inside a catch handler. Bob [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Bronek Kozicki Guest Posted: Thu Feb 23, 2006 1:06 pm    Post subject: Re: Is throwing an exception in a handler legal? Gianluca Silvestri <dishsi (AT) tin (DOT) it> wrote: Quote: Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. mistake. Throwing an exception inside catch is rather normal practice if exception must be partly handled locally and then passed to caller: try { //... } catch(...) { log_error(); throw; } ..... in translation of exceptions: try { //... } catch(std::exception& e) { throw ApplicationSpecificError(typeid(e), e.what()); } .... and in exception filtering: int filter() { try { throw; } catch (std::bad_alloc& e) { return E_MEMORY_DEPLETED; } catch (std::overflow_error& e) { return E_OVERFLOW; } catch (ApplicationSpecificError& e) { return e.code(); } catch (std::exception& e) { return E_GENERAL_FAILURE; } } // binary module boundary, must not throw C++ exceptions int foo() throw () { try { //... } catch(...) { return filter(); } return SUCCESS; } B. [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Francis Glassborow Guest Posted: Thu Feb 23, 2006 3:06 pm    Post subject: Re: Is throwing an exception in a handler legal? In article <1140617420.274026.83680 (AT) o13g2000cwo (DOT) googlegroups.com>, Gianluca Silvestri <dishsi (AT) tin (DOT) it> writes Quote: Hi all, Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. But now I cannot find any reference in the Standard or even on TCPPL supporting thi claim. Is it true? If so, what are the references? Difficult to provide references when it isn't (true that is):-) -- Francis Glassborow ACCU Author of 'You Can Do It!' see http://www.spellen.org/youcandoit For project ideas and contributions: http://www.spellen.org/youcandoit/projects [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Jeffrey Schwab Guest Posted: Thu Feb 23, 2006 3:06 pm    Post subject: Re: Is throwing an exception in a handler legal? Gianluca Silvestri wrote: Quote: Hi all, Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. But now I cannot find any reference in the Standard or even on TCPPL supporting thi claim. Is it true? If so, what are the references? Might you be thinking of the guideline that exceptions should not be thrown from destructors? [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First time posters: Do this! ] Back to top Gianluca Silvestri Guest Posted: Thu Feb 23, 2006 7:06 pm    Post subject: Re: Is throwing an exception in a handler legal? Gianluca Silvestri wrote: Quote: Hi all, Until now I was pretty sure that throwing an exception from inside a catch() handler other than re-throwing the current handled exception was a no-no. But now I cannot find any reference in the Standard or even on TCPPL supporting thi claim. Is it true? If so, what are the references? Thanks to all. I don't remember when or where I read about this. Probably I was confused by the rules about throwing an exception in a destructor during stack unwinding. Gianluca Silvestri [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. 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