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Learning C++ - a design pattern for your first class

From today's C++ Course - a new, clear example of a design pattern for a simple class, its headers, and a test harness - [here].

When using an Object Oriented language, design patterns are really useful. Essentially, they're a known and standard way of combining the features of the language in a convenstional way. By using a design pattern, you're going to be writing along the same lines as others have written before, so you'll:
• avoid some common code pitfalls
• find it easier to write your code as it will be familiar
• produce code that's easy for others to pick up and follow later on

My "SimpleClass" design pattern (as I've chosen to call it) shows a class definition, definition of each of the members, and definition of a calling program. It's very much a starting point within the course, and I went on after this example to add:
• private access for member variables, and public accessor functions
• use of this rather than using different names in the constructor
• multiple methods of the same name (I provided several constructors)

Going one stage further, I divided the code into three separate files:
• a header file which defines the API to the class - [here]
• a file which defines all the methods within the class - [here]
• and the test harness - [here].

This is becoming a much more realistic use of a class - with the test program being separated from the detail of how the class works, and the header file in a third place and shared betweenthe two program files we already have, and other programs which choose to make use of our class.

Completing this example - compile and run:

  munchkin:rcpp grahamellis$ g++ -o tabby table.cpp tabletest.cpp
  munchkin:rcpp grahamellis$ ./tabby
  Size of table 1.8
  1200
  Size of table 3.38
  munchkin:rcpp grahamellis$


We offer three different C++ courses - for delegates who haven't programmed before (5 days), for delegates who have programmed before, but not in C (4 days), and for delegates who have prior programming experience in C. See [here]. A public course series ran last week, and the next public course series runs in mid-July - already booking well, but there are still spaces left at all levels. We run private courses as required for single customer groups; as I write, just one week is available in May and you would then be looking forward several months ...
(written 2012-05-02, updated 2012-05-05)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C232 - C and C based languages - Defining and using classes in C++
  [4565] Allocation of memory for objects in C++ - Stack v Heap - (2015-10-31)
  [4372] Template / design pattern for C++ constructor and accessors - (2014-12-29)
  [4129] Simple OO demonstration in C++, comparison to Python - (2013-07-01)
  [3978] Teaching OO - how to avoid lots of window switching early on - (2013-01-17)
  [3810] Reading files, and using factories to create vectors of objects from the data in C++ - (2012-07-21)
  [3721] Naming blocks of code, structures and Object Orientation - efficient coding in manageable chunks - (2012-05-06)
  [3250] C++ - how we teach the language and the concepts behind the language - (2011-04-17)
  [2579] Creating, setting up and using objects in C++ - (2010-01-16)
  [2578] Where are your objects stored in C++? - (2010-01-16)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)

Q908 - Object Orientation and General technical topics - Object Orientation: Design Patterns
  [4673] Separating detailed data code from the main application - Ruby example - (2016-05-16)
  [4663] Easy data to object mapping (csv and Python) - (2016-03-24)
  [4626] Singleton design pattern - examples and uses - (2016-01-20)
  [4581] Thin application, thick objects - keep you main code simple. Example in Ruby - (2015-11-21)
  [4421] How healthy are the stars of stage and screen? - (2015-02-09)
  [4396] Java Utility class - flexible replacement for array. Also cacheing in objects and multiple catch clauses example. - (2015-01-16)
  [4377] Designing a base class and subclasses, and their extension, in C++ - (2015-01-01)
  [4359] How to avoid too many recalculations within an object - (2014-12-21)
  [4356] Object factories in C++, Python, PHP and Perl - (2014-12-19)
  [4330] Java - factory method, encapsulation, hashmap example - (2014-11-27)
  [4325] Learning to program - what are algorithms and design patterns? - (2014-11-22)
  [4098] Using object orientation for non-physical objects - (2013-05-22)
  [4096] Perl design patterns example - (2013-05-20)
  [4021] Spike solution, refactored and reusable, Python - Example - (2013-02-28)
  [3843] Caching Design Patterns - (2012-08-20)
  [3608] Design Patterns - what are they? Why use them? - (2012-02-12)
  [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30)
  [2741] What is a factory? - (2010-04-26)
  [2322] Looking for a practical standards course - (2009-08-05)
  [1224] Object Relation Mapping (ORM) - (2007-06-09)
  [485] North, Norther and Northest - PHP 5 Objects - (2005-11-04)


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