Re: [MacPerl] Bug?

[Michael Houghton <herveus@Radix.Net>]

Howdy!

> Hi!
> 
> Just noticed some strange behaviour, and wonder if it's a bug in MacPerl,
> or in my program.

I'd suspect the latter...
> 
> #! perl -w
> 
> use strict;
> 
> package Bug;
> 
> sub new {
> 	my $class = ref $_[0] || $_[0];
> 	print $class . " is born ...\n";
> 	bless {}, $class;
> }
> 
> sub DESTROY {
> 	print "Arggh! " . ref shift() . " is killed!\n";
putting in the parentheses implied, what you have is:
	print("Arggh! " . ref(shift() . " is killed!\n"));
but you were expecting it to mean:
	print("Arggh! " . ref(shift()). " is killed!\n");
you also could have tried:
	print "Arggh! " , ref shift() , " is killed!\n";
> }
> 
> package main;
> 
> my $a = Bug->new();
> 
> __END__
> 
> prints:
> 
> Bug is born ...
> Arggh!
> 
> and not the rest of the sentence. Changing the DESTROY sub to
> 
> sub DESTROY {
> 	print "Arggh! " . ref shift();
> 	print " is killed!\n";
> }
> 
> gives the expected result.
> 
> Any ideas?
> 
You appear to have been unclear on precedence of operators and
all that. Your change to the DESTROY sub was a step in the right
direction. You probably would be best off to use the commas to
separate the pieces being printed instead of explicitly concatenating
them with dot.

yours,
Michael
-- 
Michael and MJ Houghton   | Herveus d'Ormonde and Megan O'Donnelly
herveus@radix.net         | White Wolf and the Phoenix
Bowie, MD, USA            | Tablet and Inkle bands, and other stuff
                          | http://www.radix.net/~herveus/

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