Re: verbose exception

[Thomas Metz <tmetz free fr>]

With the good link it will be better ;-)  
http://tmetz.free.fr/verbose_exception-0.4.1.tgz

Le Vendredi 22 Septembre 2006 22:07, Thomas Metz a écrit :
> Hi,
>
> I have written a small class, called verbose_exception. The goal is to be
> able to know where an exception occurs through tracing the functions stack
> between the "throw" and the final "catch" (a verbose error message with the
> stack trace is built).
>
> I'd like to know what do you think about this kind of feature and if it
> would be interresting to add something simular in glibmm.
>
> Example of error message :
> ---------------------------------------
> Unable to read myFile.bin 2 : bad_format
> while executing "int test_ex ()" (file test_verbose_exception.cpp line 42)
> in "int test_ex ()" (file test_verbose_exception.cpp catch line 48)
> in "void test ()" (file test_verbose_exception.cpp catch line 58)
> in "int main ()" (file test_verbose_exception.cpp catch line 95)
> ---------------------------------------
> => first line : error message + user message
> => second line : file, line and function where the exception is thrown
> => other lines : functions stack
>
> The code linked to the example :
>
> int test_ex()
> {
> 	try {
> 		int fileId = 2;
> 		char * fileName = "myFile.bin";
>
> 		VE_THROW_VERBOSE_EXCEPTION(bad_format,
> 								"Unable to read " << fileName <<  " "
> 								 << fileId << " : " << VE_WHAT);
> 		return 0;
> 	}
> 	VE_CATCH_RETHROW()
> }
>
> void test()
> {
> 	try {
> 		test_ex();
> 	}
> 	VE_CATCH_RETHROW()
> }
>
> int main()
> {
> 	try {
> 		cout << " *** User exception (from user code) ***" << endl;
> 		test();
> 	}
> 	VE_CATCH_PRINT()
> 	return 0;
> }
>
> Inconvenients :
>  - a VE_CATCH_RETHROW macro shall be added on all methods / functions
>  - lots of use of macro
>
> Advantage :
>  - friendly error message for developper and for user (really easier to
> debug) - easy way to send lots of information in an exception
>  - easy way to add user exceptions.
>
> Note that some level (library) can be disabled to limit the stack.
>
> To get the experimental class :
> http://tmetz.free.fr/verbose_exception-0.4-1.tgz
>
>
> Regards,
>
> Thomas Metz