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Re^2: if(my) scope

by cdarke (Prior)
on Apr 16, 2009 at 15:44 UTC ( [id://758016]=note: print w/replies, xml ) Need Help??


in reply to Re: if(my) scope
in thread if(my) scope

Although I am sure you are right, how come:
use strict;
use warnings;
use Devel::Peek;

my $true = 1;
my $ref;

if ($true)
{
    my $fred = 42;
    $ref = \$fred;
}

print Dump($$ref);

[download]
Gives:
SV = IV(0x3b2e0) at 0x3b2e4
  REFCNT = 1
  FLAGS = (PADMY,IOK,pIOK)
  IV = 42

[download]
A reference count of 1, not 2?

Replies are listed 'Best First'.
Re^3: if(my) scope
by ikegami (Patriarch) on Apr 16, 2009 at 15:53 UTC
    You changed
    if (my $var) { ... }
    to
    if (...) { my $var; ... } 
    use strict;
use warnings;
use Devel::Peek;

my $ref;

if ((my $fred = 42), 1)
{
    $ref = \$fred;
    Dump($$ref);
}

Dump($$ref);

    [download]
    SV = IV(0x816a5cc) at 0x814f684
  REFCNT = 2
  FLAGS = (PADBUSY,PADMY,IOK,pIOK)
  IV = 42
SV = IV(0x816a5cc) at 0x814f684
  REFCNT = 2
  FLAGS = (PADBUSY,PADMY,IOK,pIOK)
  IV = 42

    [download]

    A scope is created for if's curlies, but only a compile-time scope is created for the condition expression.

    Btw, note the proper usage of Dump.

[reply]
[d/l]
[select]
      Doh!
[reply]

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