9 More Discussions You Might Find Interesting
1. Emergency UNIX and Linux Support
Hi,
I am running a perl script to automate a process and I keep running into a error can't find the "value"
Can't call method "value" on an undefined value at process_file.pl line 44.
file is CVS
cell is ifdfdxrfmp.ksh
Here is the script I have also attached it as well:
... (2 Replies)
Discussion started by: vpundit
2 Replies
2. Solaris
After a memory upgrade all network interfaces are misconfigued. How do i resolve this issue. Below are some out puts.thanks.
ifconfig: plumb: SIOCLIFADDIF: eg000g0:2: no such interface
# ifconfig eg1000g0:2 plumb
ifconfig: plumb: SIOCLIFADDIF: eg1000g0:2: no such interface
# ifconfig... (2 Replies)
Discussion started by: andersonedouard
2 Replies
3. Programming
Differentiate between the message and method. (2 Replies)
Discussion started by: robinglow
2 Replies
4. Shell Programming and Scripting
Good morning all....
I have been learning Perl for about 2 months now and I guess I am getting there as much as I can however I am really stuck. I have a Perl script called postEvent.pl which uses a package called event.pm. PostEvent.pl depends on a meithod inside event.pm called isSuccess to... (0 Replies)
Discussion started by: LRoberts
0 Replies
5. Shell Programming and Scripting
In my code, I know I can write...
if ( defined &test_sub ) {
test_sub();
} else {
print "Subroutine doesn't exist";
}
This tests the existence of the test_sub subroutine without actually calling it.
If, though, I replace test_sub with a package method...
if ( defined... (1 Reply)
Discussion started by: JerryHone
1 Replies
6. UNIX for Dummies Questions & Answers
hi
i am not getting what exactly bless function do in perl explanation in perldoc is not very clear i tried to search on google but i am getting confused or rather not getting at all. can anybody explain in short what it does in following example as well as in general ?
sub new {
my... (1 Reply)
Discussion started by: zedex
1 Replies
7. Infrastructure Monitoring
Hello,
I have a problem with package and name space.
require "/Mehran/DSGateEngineLib/general.pl";
use strict;
sub System_Status_Main_Service_Status_Intrusion_Prevention
{
my %idpstatus;
my @result;
&General_ReadHash("/var/dsg/idp/settings",\%idpstatus);
#print... (4 Replies)
Discussion started by: Zaxon
4 Replies
8. Programming
Which is the perferred method of installing Perl modules on a Unix system? Is is CPAN or manually installing them via a tar file? Also can anyone point me in the right direction to a decent "how to" on configuring CPAN and how to perform custom installs from a tar? thanks:b: (2 Replies)
Discussion started by: metallica1973
2 Replies
9. Shell Programming and Scripting
Guys, anyone familiar with this FileProp Store Method.. Im having Compilation Error whenever a value is stored into the tied hash. Run time error
sub STORE {
my ($self, $key, $value) = @_;
my $name = $self ->{name};
unless ($PROPS{$key} and -w $name){
croak "Can't... (1 Reply)
Discussion started by: killerserv
1 Replies
Object::ID(3pm) User Contributed Perl Documentation Object::ID(3pm)
NAME
Object::ID - A unique identifier for any object
SYNOPSIS
package My::Object;
# Imports the object_id method
use Object::ID;
DESCRIPTION
This is a unique identifier for any object, regardless of its type, structure or contents. Its features are:
* Works on ANY object of any type
* Does not modify the object in any way
* Does not change with the object's contents
* Is O(1) to calculate (ie. doesn't matter how big the object is)
* The id is unique for the life of the process
* The id is always a true value
USAGE
Object::ID is a role, rather than inheriting its methods they are imported into your class. To make your class use Object::ID, simply "use
Object::ID" in your class.
package My::Class;
use Object::ID;
Then write your class however you want.
METHODS
The following methods are made available to your class.
object_id
my $id = $object->object_id;
Returns an identifier unique to the $object.
The identifier is not related to the content of the object. It is only unique for the life of the process. There is no guarantee as to
the format of the identifier from version to version.
For example:
my $obj = My::Class->new;
my $copy = $obj;
# This is true, $obj and $copy refer to the same object
$obj->object_id eq $copy->object_id;
my $obj2 = My::Class->new;
# This is false, $obj and $obj2 are different objects.
$obj->object_id eq $obj2->object_id;
use Clone;
my $clone = clone($obj);
# This is false, even though they contain the same data.
$obj->object_id eq $clone->object_id;
object_uuid
my $uuid = $object->object_uuid
Like "$object->object_id" but returns a UUID unique to the $object.
Only works if Data::UUID is installed.
See Data::UUID for more details about UUID.
FAQ
Why not just use the object's reference?
References are not unique over the life of a process. Perl will reuse references of destroyed objects, as demonstrated by this code
snippet:
{
package Foo;
sub new {
my $class = shift;
my $string = shift;
return bless {}, $class;
}
}
for(1..3) {
my $obj = Foo->new;
print "Object's reference is $obj
";
}
This will print, for example, "Object's reference is Foo=HASH(0x803704)" three times.
How much memory does it use?
Very little.
Object::ID stores the ID and address of each object you've asked the ID of. Once the object has been destroyed it no longer stores it. In
other words, you only pay for what you use. When you're done with it, you don't pay for it any more.
LICENSE
Copyright 2010, Michael G Schwern <schwern@pobox.com>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
THANKS
Thank you to Vincent Pit for coming up with the implementation.
perl v5.12.4 2011-09-26 Object::ID(3pm)