in reply to Re^2: Last Line Read? (Any way to use IO::Handle methods on a "First-Class" Filehandle?)
in thread Last Line Read? (Any way to use IO::Handle methods on a "First-Class" Filehandle?)

Always always always use warnings; teach your fingers to type -wle, not -le. You are doing (print(\$fh))->input_line_number there, not print((\$fh)->input_line_number).
  • Comment on Re^3: Last Line Read? (Any way to use IO::Handle methods on a "First-Class" Filehandle?)

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Re^4: Last Line Read? (Any way to use IO::Handle methods on a "First-Class" Filehandle?)
by naikonta (Curate) on Jun 08, 2007 at 08:42 UTC
    OK, how about this? 
    $ cat /tmp/io.pl
#!/usr/bin/perl

use strict;
use warnings;
use IO::Handle;

my $filename = shift || $0;
my $fh = IO::Handle->new;
open $fh, $filename or die "failed on $filename: $!\n";
print((\$fh)->input_line_number, "\n") while <$fh>; #1
#print $fh->input_line_number, "\n" while <$fh>; #2
$ perl /tmp/io.pl
Can't call method "input_line_number" on unblessed reference at /tmp/i
+o.pl line 10, <GEN0> line 1.

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    The #2 prints the line numbers correctly. Did I miss something? Please shed some light.

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[reply]
[d/l]
      Did I miss something?
      Just that I was trying to answer the parenthetical question in the title. 
      $ perl - foo
use strict;
use warnings;
use IO::Handle;

my $filename = shift || $0;
my $fh = do {local *FH};
open $fh, $filename or die "failed on $filename: $!\n";
print((\$fh)->input_line_number, "\n") while <$fh>; #1
#print $fh->input_line_number, "\n" while <$fh>; #2
__END__
Name "main::FH" used only once: possible typo at - line 6.
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