Re: [Swig-user] Better error messages from Perl wrappers?

[William S F. <ws...@fu...>]

Tod Hagan wrote:
> Hi,
> 
> I'm wrapping some C++ to interface to Perl. The error messages produced
> by the default wrappers look like:
> 
>     ValueError invalid null reference in method 'new_Foo', argument 2
> of type 'Bar &'
> 
> The error is apparently generated by this code in the _perlwrap.cxx file:
> 
>     if (!argp2) {
>       SWIG_exception_fail(SWIG_ValueError, "invalid null reference "
> "in method '" "new_Foo" "', argument " "2"" of type '" "Bar &""'");
>     }
> 
> To be more useful, the line number of the offending script should be
> printed. It's not, apparently because the perl error routine (croak?)
> isn't called.
> 
> Is there a way to get the argument validation logic in the default
> wrappers for Perl to call one of perl's error routines so that useful
> context such as line number can be printed?
> 
I am not familiar really with Perl, but have a look to see if you can 
implement this by modifying SWIG_exception_fail.

William