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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Making Perl class definitions more conventional and shorter

Perl 5's object oriented capabilities are excellent - but often a little longwinded, and quite easy to get wrong. Moose sells itself as "postmodern object system for Perl 5 that takes the tedium out of writing object-oriented Perl"; it's available for download from the CPAN under same license as Perl itself, and provides a good solution for certain groups of people. There does, however, seem a lack of "start here" examples ... so I've added a few to the web site.

Simplest Moose class - setting up an automatic constructor with two properties - [source].

Adding default values - [source].

Using Moose to check data types - [source].

Calling automatically generated functions, and with read only and read-write settings - [source] This is the first practical example as it sets up the access to properties via methods rather than direct variable access

Inheritance (using the extends keyword) and roles (i.e. interfaces / the requires keyword) in Moose - [source].

Getters, setters and defaults in Moose - [source].

Additional functionality - adding a second method with the after keyword - [source].

Would I use Moose on a project? If there were many classes to be written, and I was writing from scratch I might well give it some careful thought. It is just a wrapper around a blessed hash, but sometimes the wrapping can make all of the difference!
(written 2010-12-20, updated 2010-12-24)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P310 - Perl - Moose
  [3098] Learning Object Orientation in Perl through bananas and perhaps Moose - (2010-12-21)

P218 - Perl - More Objects
  [227] Bellringing and Programming and Objects and Perl - (2005-02-25)
  [246] When to bless a Perl variable - (2005-03-15)
  [531] Packages in packages in Perl - (2005-12-16)
  [588] Changing @INC - where Perl loads its modules - (2006-02-02)
  [592] NOT Gone phishing - (2006-02-05)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [831] Comparison of Object Oriented Philosophy - Python, Java, C++, Perl - (2006-08-13)
  [930] -> , >= and => in Perl - (2006-11-18)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1320] Perl for Larger Projects - Object Oriented Perl - (2007-08-25)
  [1435] Object Oriented Programming in Perl - Course - (2007-11-18)
  [1664] Example of OO in Perl - (2008-06-03)
  [1665] Factory method example - Perl - (2008-06-04)
  [1819] Calling base class constructors - (2008-10-03)
  [1949] Nuclear Physics comes to our web site - (2008-12-17)
  [2427] Operator overloading - redefining addition and other Perl tricks - (2009-09-27)
  [2651] Calculation within objects - early, last minute, or cached? - (2010-02-26)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2811] Igloos melt in the summer, but houses do not - (2010-06-15)
  [2876] Different perl examples - some corners I rarely explore - (2010-07-18)
  [2972] Some more advanced Perl examples from a recent course - (2010-09-27)
  [3377] What do I mean when I add things in Perl? - (2011-08-02)
  [3581] Perl - calls to methods that use => - what do they mean? - (2012-01-16)
  [3941] Building an object based on another object in Perl - (2012-12-03)
  [4096] Perl design patterns example - (2013-05-20)
  [4098] Using object orientation for non-physical objects - (2013-05-22)
  [4356] Object factories in C++, Python, PHP and Perl - (2014-12-19)
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)


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Learning Object Orientation in Perl through bananas and perhaps Moose
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The week before Christmas
Looking ahead and behind in Regular Expressions - double matching
Perl - database access - DBD, DBI and DBIx modules
Making Perl class definitions more conventional and shorter
Contrast in pictures
The Christmas Season has arrived
Setting your user_agent in PHP - telling back servers who you are
How many toilet rolls - hotel inventory and useage
wxPython geometry - BoxSizer example
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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