bionic (3) Carp::Always.3pm.gz

NAME

       Carp::Always - Warns and dies noisily with stack backtraces

SYNOPSIS

         use Carp::Always;

       makes every "warn()" and "die()" complains loudly in the calling package and elsewhere. More often used
       on the command line:

         perl -MCarp::Always script.pl

DESCRIPTION

       This module is meant as a debugging aid. It can be used to make a script complain loudly with stack
       backtraces when warn()ing or die()ing.

       Here are how stack backtraces produced by this module looks:

         # it works for explicit die's and warn's
         $ perl -MCarp::Always -e 'sub f { die "arghh" }; sub g { f }; g'
         arghh at -e line 1
                 main::f() called at -e line 1
                 main::g() called at -e line 1

         # it works for interpreter-thrown failures
         $ perl -MCarp::Always -w -e 'sub f { $a = shift; @a = @$a };' \
                                  -e 'sub g { f(undef) }; g'
         Use of uninitialized value in array dereference at -e line 1
                 main::f('undef') called at -e line 2
                 main::g() called at -e line 2

       In the implementation, the "Carp" module does the heavy work, through "longmess()". The actual
       implementation sets the signal hooks $SIG{__WARN__} and $SIG{__DIE__} to emit the stack backtraces.

       Oh, by the way, "carp" and "croak" when requiring/using the "Carp" module are also made verbose, behaving
       like "cluck" and "confess", respectively.

   EXPORT
       Nothing at all is exported.

ACKNOWLEDGMENTS

       This module was born as a reaction to a release of Acme::JavaTrace by Sebastien Aperghis-Tramoni.
       Sebastien also has a newer module called Devel::SimpleTrace with the same code and fewer flame comments
       on docs. The pruning of the uselessly long docs of this module were prodded by Michael Schwern.

       Schwern and others told me "the module name stinked" - it was called "Carp::Indeed". After thinking long
       and not getting nowhere, I went with nuffin's suggestion and now it is called "Carp::Always".
       "Carp::Indeed" which is now deprecate lives in its own distribution (which won't go anywhere but will
       stay there as a redirection to this module).

SEE ALSO

       •   Carp

       •   Acme::JavaTrace and Devel::SimpleTrace

       •   Carp::Always::Color

       •   Carp::Source::Always

       Please report bugs via CPAN RT http://rt.cpan.org/NoAuth/Bugs.html?Dist=Carp-Always.

BUGS

       Every (un)deserving module has its own pet bugs.

       •   This module does not play well with other modules which fusses around with "warn", "die",
           $SIG{'__WARN__'}, $SIG{'__DIE__'}.

       •   Test scripts are good. I should write more of these.

       •   I don't know if this module name is still a bug as it was at the time of "Carp::Indeed".

AUTHOR

       Adriano Ferreira, <ferreira@cpan.org>

COPYRIGHT AND LICENSE

       Copyright (C) 2005-2012 by Adriano R. Ferreira

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.