#29 Document how to use ExitException to avoid program termination

[Alexander Brock]

I'm using TCLAP on Debian (libtclap-dev 1.2.2-1+b1) and I use it to parse messages I send between long-running programs. Sometimes I mistype an argument name which leads to a call to exit() at the end of CmdLine::parse, killing my program. Could that function instead just throw an ExitException I can catch?

[Daniel Aarno]

Would it work to call setExceptionHandling(false) to allow the exception to propagate?

[Alexander Brock]

That works nicely for me, thank you.
I think the manual should be updated, in the example it says "catch (TCLAP::ArgException &e) // catch any exceptions" so I got confused when my program terminated and gdb wouldn't show me any reason for that.

[Daniel Aarno]

Yeah, this was initially added as an internal implementation detail to allow resources to be cleaned up before exiting, but it can actually be useful in cases such as you described. I think we should document it properly.

[Daniel Aarno]

Documentation has been updated for both 1.2 and 1.4.