What a lot of files! (C++ / Polymorphism demo)

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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))

There were no less than SEVEN files in the example I wrote to show a "simple" demonstration of polymorphism in C++ yesterday ...

1. The methods for a base class of file objects - Film.cpp
2. The extra methods on top of the base class for a derived class of Blockbuster objects - Blockbuster.cpp
3. The extra methods on top of the base class for a derived class Cinema.cpp
4. The header file Film.h, for inclusion in each of the above
5. The header file Cinema.h for inclusion in that extended class and the test application
6. The header file Blockbuster.h for inclusion in that extended class and the test application
7. The test application - flix.cpp

Why so many files?

a) Because C++ is a language that is designed for the larger application, and it's not really intended for tiny programs such as this - the seven files are indeed a lot to start off with, but the code can be extended from this trivial job up to something much MUCH bigger.

b) Because each of the sections might be maintained by a separate programmer and so it's a good structure through which that maintainance can be done independently

c) Because the use of header files which are included in two or more of the sections of program allows the programmers to maintain a single set of method descriptions rather than duplicated code, with all the synchronisation and extra headaches that might bring.

And these are all excellent reasons, aren't they?

The complete example is in our source code library. But I have NOT put all seven files up separately, to produce a heptagonal array of extra window when you click on the link ... just click here for a single extra window containing all the source to see the whole example in one go.
(written 2008-06-12)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

C233 - C and C based languages - OO in C++ - beyond the basics
  [798] References and Pointers in C++ - (2006-07-10)
  [801] Simple polymorphism example - C++ - (2006-07-14)
  [831] Comparison of Object Oriented Philosophy - Python, Java, C++, Perl - (2006-08-13)
  [925] C++ - just beyond the basics. More you can do - (2006-11-14)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1572] C - structs and unions, C++ classes and polymorphism - (2008-03-13)
  [1819] Calling base class constructors - (2008-10-03)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [2845] Objects and Inheritance in C++ - an easy start - (2010-07-01)
  [3056] C++ - a complete example with polymorphism, and how to split it into project files - (2010-11-16)
  [3123] C++ objects - some short, single file demonstrations - (2011-01-07)
  [3124] C++ - putting the language elements together into a program - (2011-01-08)
  [3142] Private and Public - and things between - (2011-01-22)
  [3244] C and C++ - preprocess, compile, load, run - what each step is for - (2011-04-12)
  [3251] C++ - objects that are based on other objects, saving coding and adding robustness - (2011-04-17)
  [3508] Destructor methods in C++ - a primer - (2011-11-05)
  [3811] Associated Classes - using objects of one class within another - (2012-07-21)
  [3979] Extended and Associated objects - what is the difference - C++ example - (2013-01-18)
  [4356] Object factories in C++, Python, PHP and Perl - (2014-12-19)
  [4375] Final examples for 2014 - and a look at our 2015 training course options - (2014-12-31)
  [4377] Designing a base class and subclasses, and their extension, in C++ - (2015-01-01)
  [4559] When do I use the this keyword in C++? - (2015-10-29)
  [4560] Variables, Pointers and References - C and C++ - (2015-10-29)

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What a lot of files! (C++ / Polymorphism demo)
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