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Delphi self keyword

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self

delphi

I am learning Delphi reading Marco Cantu's book and it's super complete. It's very clear but I have a doubt about the keyword self. I already have experience with OOP and I have the basics of it. My question is very simple. Can I compare the keyword self (Delphi) to the keyword this (Java)?

When I read on the book about the self used inside record, I got in my mind something like self : Delphi = this : Java. Look at the code I created to make a test:

type
 TMarioKart = packed record
   Character: String;
   Kart: String;
   Tires: String;
   Speed: double;
   Competitive: boolean;
  private
   air-speed: integer;
   ground-speed: integer;
   water-speed: integer;
  public
   constructor Create(Character: string);
   function ShowStats(a: TMarioKart):string; overload;
   function ShowStats(a: TMarioKart; b: TMarioKart): string; overload;
 end;

I am going to cut off the biggest part of the code, I am just showing the constructor here:

constructor TMarioKart.Create(Character: string);
begin
  self.Character := Character;
end;

Using the keyword self here I am referring to the Character of the record, and not to the Character passed in the method. Is this the correct way to use the self? Could it be the brother of Java's this?

like image 224
Alberto Miola Avatar asked Aug 11 '16 10:08

Alberto Miola


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What is Self in Delphi?

In every method, Delphi declares the Self variable as a hidden parameter. In a method, the value of the Self variable is the object reference. In a class method, Self is the class reference.

What is the Self variable?

The self variable is used to represent the instance of the class which is often used in object-oriented programming. It works as a reference to the object. Python uses the self parameter to refer to instance attributes and methods of the class.

What is self keyword in C++?

self is used in Objective-C classes to represent a pointer the current instance. this is used in C++ classes to represent a pointer the current instance. They perform analogous roles but on entirely different structures.

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1 Answers

Yes, Delphi's Self is the direct analogue of Java's this.

like image 193
David Heffernan Avatar answered Sep 24 '22 20:09

David Heffernan