--- Paul Lalli <[EMAIL PROTECTED]> wrote:
> On Aug 13, 2:39 pm, [EMAIL PROTECTED] (Robert Hicks)
> wrote:
> > I typically "use Carp;" and change my "die" and
> "warn" statements to
> > "croak" and "carp". I have read a couple places
> croak/carp are a little
> > better at telling you what and where than the
> standard die/warn.
>
> There is no right or wrong here. croak() and die()
> are used for two
> different purposes. You use each one when it's
> appropriate to use
> them.
>
> In a subroutine or method, you use croak/carp if the
> error is
> something the caller of your code did wrong. You
> use die/warn if the
> error is something unexpected in your code. For
> example:
>
> package MyClass;
> sub new {
> my $class = shift;
> my $name = shift or croak "Must pass name
> parameter to new()
> method!";
> open my $cfg_fh, '<', 'MyClass.cfg' or die
> "Unable to open config
> file: $!";
> chomp(my $attr = <$cfg_fh>);
> my $ref = { name => $name, attr => $attr };
> return bless $ref, $class;
> }
>
> If the user forgets to pass the name parameter to
> your class, you need
> to tell the user which call to new() it was that has
> the error. The
> user doesn't care that it happened in line 4 of your
> module.
>
> If the configuration file cannot be opened, you want
> to know where in
> your module you attempted to open it so you can see
> if it has the
> right name or whatnot. You don't care where in the
> calling code new()
> was called.
>
> Paul Lalli
>
>From the Perl Review and my understanding as well, use
Carp with keywords carp and croak is supposed to
provide additional detail in your errors and warnings.
Also similar to stating 'use diagnostics;'
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