By Nick Hodges

Coding in Delphi is a brand new programming booklet by way of Nick Hodges that covers quite a few strong Delphi programming positive aspects and strategies together with Generics, Interfaces, Exception, dealing with, nameless tools, Collections, RTTI, Enumerators, Attributes, Dependency Injection and Unit trying out

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Well, no, we do not. The code is going to be the same whether you are tracking strings or TWidgets. The type Understanding Generics 29 doesn’t matter, right? If only there was a way that we could just somehow pass in the type itself as a parameter, and then have a stack that operates on that passed-in type! Hah! We can! That’s exactly what generics do. >). The T represents any type at all. The code uses the T all throughout the code as if the T were the actual type. T is a convention for the variable name and is generally understood to represent ‘type’.

It’s quite straight forward. You simply declare a variable of the interface type you want to create, and then assign to it an instance of an object that implements that interface. '); end; Here are some things to note about the simple example above: • First, TPerson descends from TInterfacedObject, and therefore it meets the minimum requirements for implementing an interface – that is, _AddRef, _Release, and QueryInterface. • NamedPerson is defined as IName. This means that you can only call the methods of IName on NamedPerson even though TPerson may have more methods than IName does.

End; Here are some things to note about the simple example above: • First, TPerson descends from TInterfacedObject, and therefore it meets the minimum requirements for implementing an interface – that is, _AddRef, _Release, and QueryInterface. • NamedPerson is defined as IName. This means that you can only call the methods of IName on NamedPerson even though TPerson may have more methods than IName does. finally block with a call to Free. Sure, you create an object, but the compiler will keep track of all references to the instance and free it when there are no references left.

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