FiveTech Software tech support forums

... with object-oriented programming (OOP), especially regarding modularity and encapsulation. However, it lacks classical OOP elements like inheritance and polymorphism. The use of multiple levels of patchers and preprocessors for composing components resembles the OOP principle of composition. ...

... while using the updated commands. This was especially true for the button bar, and how email has been handled. What I like about inheritance is that I can write my modifications and never touch the FW libraries when they are updated. For me it has worked very well, and it is very ...

Hello Tim, I just want to briefly comment on inheritance. I use it. I think concepts always need to be reevaluated over and over again. The powerful editors with comparison functions (e.g., VS) make it very easy to compare different states of software. ...

... is a hash. - For tree browses, if the programmer does not specify any bitmaps, xbrowse provides default bitmaps. * TREES: (LinkList class) - Inheritance from TTreeItem class. It is now possible to derive class from TTreeItem and create trees with the same command syntax using the new derived ...

... both procedural programming (which makes use of functions) and object-oriented programming (including features such as single and multiple inheritance, but Harbor also supports these two things. and then I don't understand what is needed to convert programs made on python to harbour that ...

Design your forms and share them. Other users modify them (visual inheritance) and share them again... This way forms turns into social self-contained entitites, with full functionality that can be shared and reused: https://harbour.fourtech.es/modharbour_samples/designer.prg?20190825071550 ...

... that TDbcombo inherits from TCombobox which inherits from TControl which inherits from TWindow. Most of the FW language is written using objects. Inheritance is a good thing, not something to be avoided. Inheritance is one of the key concepts of Object Oriented Programming. This allows you to ...

... that TDbcombo inherits from TCombobox which inherits from TControl which inherits from TWindow. Most of the FW language is written using objects. Inheritance is a good thing, not something to be avoided. Inheritance is one of the key concepts of Object Oriented Programming. This allows you to ...

No, sorry. But I would never use EXTEND so extensively. EXTEND is absolutely not a replacement for inheritance.

EMG

Enrico, have you checked the difference in size of the EXE using "inheritance" and using "Extend" of a class?

From the perspective of OOP, you should use inheritance without any doubts. But pragmatically, sometimes it is easier to extend an existing class because you don't have to change all the places where you are using it.

EMG

Otto wrote:is there much difference between inheriting and extending the inherited class to extend a class.

Yes. With EXTEND you are not creating a new class but you are extending an existing class. So inheritance is not involved here.

EMG

... advance one can make in programming. As I have said before, the main concepts used in OOP are granularity, polymorphism, encapsulation, and inheritance. I am using all of these here. Inheritance: This class is inheriting from my TRecord class which inherits from my TData class. Granularity: ...

... CLASS TCustomers from TDatabase Meaning that I create a new class Tcustomer and ALL actions inside Tdatabase will become available. Yes, that is inheritance. Likewise when start to design objects, look for common code and move it up the hierarchy. Then you create your own methods. METHOD printCustList() ...

... hasn't been updated since 2006, because I haven't found any need for an update. It is still working fine. This is one of the advantages of OOP and inheritance. Note that TData uses TDatabase as its parent class, so new features that are added to TDatabase are automatically inherited by TData. TData ...