hi,
I am pretty new both to unix and this forum, can anyone help me to give shortcuts to my commands...
eg:-
instead of "cd /usr/bin"
i want to to give " bin " and get to that path.
I'm using HP-UX 11.0
abey (2 Replies)
hi,
I am pretty new both to unix and this forum, can anyone help me to give shortcuts to my commands...
eg:-
instead of "cd /usr/bin"
i want to to give " bin " and get to that path.
I'm using HP-UX 11.0
abey (2 Replies)
Hi Guys,
I very new to bt-basic even I got 8 years experience on UNIX. I searched through google about bt-basic but nothing really give me solid documentation. Anybody have documentation or manual for this bt-basic? Pls help me (2 Replies)
Hi everyone, I need some help! I know that this is a very simple little problem but I seem to be stuck. I was just wondering if you could show me the right way.
I basicly have to write a single line of commands (using piping) to do the following:
From the file data.txt, select all of the... (2 Replies)
Hi,
Good morning
I want to install HP-Unix in my PC.
I already have windows XP home edition in my PC.
I do not want remove XP,But I need HP-Unix in the same system.
Is it posssible?
If it is what is the name and version of HP-Unix cd?
Where can I get the CD to install.
I have... (4 Replies)
Hi ,
I need to know the difference between $((command)) and $(command) and $(($(command))).
"" and '' and ``.
I have tried searching the help files but cant able to find this.
Could you let me knoq about any document.
Thanks (4 Replies)
There isn't much of a relation between 80's BASIC and today's BASIC.
A lot of languages seem similar. The BASIC I worked with was Dartmouth or VSBASIC. Now existing as ATARI BASIC. PERL and JULIA look appealing, it would be nice if there where a program like VSBASIC. 80's... (7 Replies)
Discussion started by: teak
7 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)