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Re: CGI::Buildform

by Brovnik (Hermit)
on Aug 30, 2001 at 14:36 UTC ( #109038=note: print w/replies, xml ) Need Help??


in reply to CGI::Buildform

One brief comment - Always use the 2 argument form of bless,
bless($self,$class);
so that the class can be subclassed. You may need to check the $class, depending on how it is called, so
my $proto = shift; my $class = ref($proto) || $proto; # stuff to create self bless($self,$class);
is good practice. bless returns the item as well, so you could write your new() method as
sub new { my ($proto,$name,$type,$end) = @_; my $class = ref($proto) || $proto; return bless { name => $name, type => $type, end => $end, attributes => {}, }, $class; }

--
Brovnik

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[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.

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