Delphi
Basics
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Program structure :
Object orientation
Type
Name
Summary
Directive
Abstract
Defines a class method only implemented in subclasses
Keyword
As
Used for casting object references
Keyword
Class
Starts the declaration of a type of object class
Keyword
Constructor
Defines the method used to create an object from a class
Keyword
Destructor
Defines the method used to destroy an object
Directive
Dynamic
Allows a class method to be overriden in derived classes
Procedure
FreeAndNil
Free memory for an object and set it to nil
Directive
Index
Principally defines indexed class data properties
Keyword
Inherited
Used to call the parent class constructor or destructor method
Keyword
Interface
Used for Unit external definitions, and as a Class skeleton
Keyword
Is
Tests whether an object is a certain class or ascendant
Keyword
Object
Allows a subroutine data type to refer to an object method
Directive
Overload
Allows 2 or more routines to have the same name
Directive
Override
Defines a method that replaces a virtual parent class method
Function
Printer
Returns a reference to the global
Printer
object
Directive
Private
Starts the section of private data and methods in a class
Keyword
Property
Defines controlled access to class fields
Directive
Protected
Starts a section of class private data accesible to sub-classes
Directive
Public
Starts an externally accessible section of a class
Directive
Published
Starts a published externally accessible section of a class
Variable
Self
Hidden parameter to a method - refers to the containing object
Type
TObject
The base class type that is ancestor to all other classes
Directive
Virtual
Allows a class method to be overriden in derived classes
Run Time Library
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© Neil Moffatt
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