SPUG: Tracing back to a calling sub

Jay Scherrer jay at scherrer.com
Mon Jan 24 14:10:33 PST 2005

Couldn't  you use a class shift?
I know from using Perl::Tk you  would call mySub like this:

$myinstance->mysub($arg1, $arg2);
When this gets passed the -> acts like a comma seperated list.
And from the pakage::MySub you would get this:
sub MySub {

my $this = shift;
my (%Args) = @_;
if (! $Args{Query}) {die "A null querry was passed to MySub from 

Jay Scherrer

On Monday 24 January 2005 08:34 am, Peter Darley wrote:
> Folks,
>  I'm trying to figure out if there's a way for a sub to find out
> what sub called it?  The situation that I'm in is that I have a lot
> of generic subs, such as one that takes a database query string and
> returns a hash of what was loaded from the database.  When it
> fails, I just get an error from the sub, but it's almost always a
> error in how I called the sub that caused problems, and it can be
> hard to go back through my program and find which sub called this
> sub incorrectly.
>  So, basically what I want to be able to do is have something like:
> sub MySub
> {
>  my (%Args) = @_;
>  # Args: Query = The query to run the Lookup on
>  if (! $Args{Query}) {die "A null querry was passed to MySub from
> $Calling_Sub!"}
>  ...
> }
>  And it would come up with something like
>  "A null querry was passed to MySub from LookupUserInfo()!"
> Thanks,
> Peter Darley
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