Class Methods

A class method is a method (other than a constructor) that operates on classes instead of objects. The definition of a class method must begin with the reserved word class. For example, type

TFigure = class public class function Supports(Operation: string): Boolean; virtual; class procedure GetInfo(var Info: TFigureInfo); virtual;

end;

The defining declaration of a class method must also begin with class. For example, class procedure TFigure.GetInfo(var Info: TFigurelnfo); begin end;

In the defining declaration of a class method, the identifier Self represents the class where the method is called (which could be a descendant of the class in which it is defined). If the method is called in the class c, then Self is of the type class of c. Thus you cannot use Self to access fields, properties, and normal (object) methods, but you can use it to call constructors and other class methods.

A class method can be called through a class reference or an object reference. When it is called through an object reference, the class of the object becomes the value of Self.

Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

Get My Free Ebook


Post a comment