Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
It may be interesting to note how reference count grows. Here's an example of reference counts to the scalar $a, with explanation in comments:
use Devel::Peek qw(SvREFCNT); my $a = 9; # 1 = $a is an SV of an IV with refcnt of + 1 warn SvREFCNT($a), "\n"; my $b = \$a; # 2 = (anonymous) scalar ref maintained b +y $b warn SvREFCNT($a), "\n"; my $d = my $c = $b; # 4 = two more ref copies made warn SvREFCNT($a), "\n"; my $f = my $e = \$b; # 4 = $a unaffected by references _to_ $b warn SvREFCNT($a), "\n"; my $g = [ $a ]; # 4 = copy of value $a in array warn SvREFCNT($a), "\n"; my $h = [ $c ]; # 5 = copy of ref to $a in array warn SvREFCNT($a), "\n"; my $i = sub { $b, $c, $e }; # 5 = $a unaffected by closure over _refs +_ to $a warn SvREFCNT($a), "\n"; my $j = sub { $a, $a, $a }; # 6 = closure over actual lexical $a warn SvREFCNT($a), "\n"; undef $_ for $b, $c, $d, $h, $j; # 1 = kill all refcnt contributors ( +except for $a itelf) warn SvREFCNT($a), "\n";

In reply to Re: Does Scope of Referenced Array Matter? by repellent
in thread Does Scope of Referenced Array Matter? by NOYB

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others cooling their heels in the Monastery: (7)
As of 2024-03-28 21:03 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found