Access Class Variables from Object Methods

This section describes how to Access Class Variables from Object Methods.

If you want to access class variables from an object method, you need to use the parent scope qualifier (^) as shown in this example:

$class user: {
   
   # class variable
   counts = 0;
   
   $instance x: {
      x.login;
      x.password;
      $method x._first(l="guest", p="DontTell"): {
         x.login = l;
		 x.password = p;
		 
		 # access class variables
		 ^.^.counts++;
      };
      $method x.changePassword(newPassword): {
         x.password = newPassword;
      }
      $method x.showPassword(): {
	     write(x.password);
      }
   }
}

a = user(); 
b = user("herong"); 
c = user(p="******"); 

write(user.counts); # prints 3

Last update: 2017.

Table of Contents

 About This Book

 Introduction of H Language

 Syntax

 Data Types

 Variables

 Expressions

 Statements

 "boolean" Data Type

 "integer" Data Type

 "string" Data Type

 "real" Data Type

 "array" Data Type

 Source Code Packages

Classes and Objects

 What Is Class

 What Is Object

 $class Statement - Create New Classes

 Class Variables and Functions

 Execution of $class Definition Body

 __new() - Object Constructor Function

 $instance Statement - Define Instance Template

 Execution of $instance Definition Body

 Access Object Properties

 $method Statement - Define Object Method

 Access Object Methods

 _first() Method - Object Initialization

Access Class Variables from Object Methods

 __delete() - Object Destructor Method

 $delete Statement - Delete Objects

 _last() Method - Object Cleanup

 Object Oriented Programming

 Inheritance - Object Attachments

 Encapsulation - Private Members

 References

 PDF Printing Version