Perl - More Objects

Perl module P218

More Objects

Exercises, examples and other material relating to training module P218. This topic is presented on public course Perl for Larger Projects

Perl for Larger Projects - training course - Objects, huge data, SQL databases, XML, efficiency and other topics.

Perl for Larger Projects - Objects, huge data, SQL databases, XML, efficiency and other topics. This advanced course takes the Perl programmer through ...

http://www.wellho.net/course/plfull.html [course]

Changing @INC - where Perl loads its modules

Where does Perl load modules from in its use and require statements? It loads them from directorys in a special list called @INC, from files with a .pm ...

http://www.wellho.net/mouth/588_Chan ... dules.html [short article]

When to bless a Perl variable

Perl's bless function, which turns a reference into an instance of an object, it typically called up as the last action in a constructor method. On today's ...

http://www.wellho.net/mouth/246_When ... iable.html [short article]

Calling base class constructors

In all object oriented languages, you have a facility called inheritance where you can define one type of thing ("class of object") based on another, ...

http://www.wellho.net/mouth/1819_Cal ... ctors.html [short article]

Comparison of Object Oriented Philosophy - Python, Java, C++, Perl

There are two different philosophies that have been adopted by the authors of Object Oriented languages. The first approach is to set the thing up in ...

http://www.wellho.net/mouth/831_Comp ... -Perl.html [short article]

What are factory and singleton classes?

Do you find some of the OO terminolgy baffling? Once you've learnt about constructors and methods, inheritance, overloading and polymorphism and statics, ...

http://www.wellho.net/mouth/1217_Wha ... sses-.html [short article]

Packages in packages in Perl

In perl, all your variables (except "my" ones, which we'll leave for another day) are arranged into packages, and by default that's a package called "main". ...

http://www.wellho.net/mouth/531_Pack ... -Perl.html [short article]

How do we define Inheritance and overloading in Perl? What inherits from where? What happens if a method is missing? How do we make variables from a module available in a calling module?

This topic is presented on public course Perl for Larger Projects

Examples from our training material

angler	Program to demonstrate use of phisherman class
animal.pm	A framework for a generic base class
basket	Sample program - polymorphism in Perl OO
cafe	Test application to show use of exporter
coin.pm	Simple base class defining a coin
collect	Application that uses commememorative coin class
commemorative.pm	A class which uses simple inheritance
dish.pm	Illustation of Exporter and @EXPORT
fldo	Set up obects via a utility factory (main prog)
fruit.pm
horse.pm	BEGIN END DESTROY and import special methods
li2	the @INC list and the %INC hash
lookinc	Display the @INC list
offspring.pm	class offspring - an animal that need attention
pet.pm	a pet is an animal ... inheritance ...
phisherman.pm	A simple class in Perl
ptest	test harness for the program.pm class
rider	Application that uses horse.pm
test_class_1	Test harness for class "animal"
test_class_2	Test harness for the various subclasses of animal
tharness	Perl program, calls 2 classes, polymorphism and interitance
tptest	Test program for the trainingprogram.pm class
transport.pm	Definition of a transport animal
ua	Looking at data via Data::Dumper
visit.pm	Set up obects via a utility factory (classes prog)

Pictures

Object Oriented programming for larger projects

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

A Generic Class.
Where to look for modules.
Inheritance and hierarchy.
The Base class.
The derived class.
Special methods.
Imports and exports.
Exporting variables.
Importing variables.
Further notes on object orientation.
Extending our earlier generic example.
Summary.

Complete learning

If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.