By Nick Hodges
Coding in Delphi is a brand new programming booklet through Nick Hodges that covers a number of strong Delphi programming good points and methods together with Generics, Interfaces, Exception, dealing with, nameless tools, Collections, RTTI, Enumerators, Attributes, Dependency Injection and Unit trying out
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Extra resources for Coding In Delphi
Things like TList
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.
But their use will, as I mentioned above, start you thinking about your code in new, interesting and powerful ways. A Simple Example First, they can be used to define a method signature that your code can call, but that can be defined later. This enables you to define a class that is open to additional functionality at run-time by consumers of that class. Here’s an example. Let’s say you want to create a simple calculator. You might do it like this: Understanding Anonymous Methods 48 type TCalculator = class function Add(x, y: integer): integer; function Subtract(x, y: integer): integer; end; ...
Coding In Delphi by Nick Hodges