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By Nick Hodges

Coding in Delphi is a brand new programming e-book by means of Nick Hodges that covers quite a few robust Delphi programming beneficial properties and strategies together with Generics, Interfaces, Exception, dealing with, nameless equipment, Collections, RTTI, Enumerators, Attributes, Dependency Injection and Unit checking out

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And there might be other entities that need different types of ID tags. Instead of fretting about those different types of ID tags, how about just create one that doesn’t care what type it is? Well, this is where the power of generics comes in. How about you give the TEntity class a parameterized type – a generic – as its ID, and then just tell all the classes what type their ID tag will be? type TEntity = class ID: T; end; TOrderItem = class(TEntity) end; TOrder = class(TEntity) end; TCustomer = class(TEntity) end; Now, given the above, your entities can all have ID’s, but you don’t have to have the same type for all of them.

I can’t find it’s origin, and I did try. If the quote is yours, please let me know and I’ll be happy to provide proper attribution. ) Intermodule Communications But wait, there is more! Interfaces are good for inter-module communications. Say you have a large system with different teams working on different major modules. Those teams are responsible for providing functionality in their own modules, and thus they are responsible for the integrity and quality of the code in their modules. Let’s say you are on the Widget team, and you need the Sprocket team to do something for you.

As I’ve said before, and I’ll say again: A good developer codes against abstractions, and not implementations. Interfaces are a great way to create abstractions. If you want a thorough discussion Using Interfaces 24 on why this is a good idea, I suggest reading Erich Gamma on the topic² – but I’ll talk a bit about it here. Pluggable Implementations If you program against abstractions, you can’t couple yourself to a specific implementation. Interfaces allow you to make the coupling between your classes very loose.

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