Objects (or References) and Classes (or Packages)
This chapter provides tutorial examples and notes about objects and classes. Topics include converting references to objects by bless(); using packages as classes; invoking package subroutines as class or object methods; creating objects within a package by new(); Example of a simple Perl class, CalendarClass.pm.
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Basic Concepts of Classes and Objects
Invoking Package Subroutines as Class Methods
bless() - Converting References to Objects
Invoking Package Subroutines as Object Methods
Class Variables and Object Variables
new() Method - Creating Objects by the Class
CalendarClass.pm - A Perl Class Example
- A class is package with a new() subroutine to return an object, and
other subroutines to be invoked as class methods and object methods.
- An object is a reference blessed with a package name.
- Class methods and object methods are invoked with the "->" notation.
- Class variables are variables defined in the package scope.
- Object variables are pairs of keys and values stored in the hash referenced by the object.
Table of Contents
About This Book
Perl on Linux Systems
ActivePerl on Windows Systems
Data Types: Values and Variables
Expressions, Operations and Simple Statements
User Defined Subroutines
Perl Built-in Debugger
Name Spaces and Perl Module Files
Symbolic (or Soft) References
Hard References - Addresses of Memory Objects
►Objects (or References) and Classes (or Packages)
Typeglob and Importing Identifiers from Other Packages
String Built-in Functions and Performance
File Handles and Data Input/Output
Open Files in Binary Mode
Open Directories and Read File Names
File System Functions and Operations
Converting Perl Script to Executable Binary
Using DBM Database Files
Using MySQL Database Server
Socket Communication Over the Internet
XML::Simple Module - XML Parser and Generator
XML Communication Model
SOAP::Lite - SOAP Server-Client Communication Module
Perl Programs as IIS Server CGI Scripts
CGI (Common Gateway Interface)
XML-RPC - Remote Procedure Call with XML and HTTP
RPC::XML - Perl Implementation of XML-RPC
Integrating Perl with Apache Web Server
CGI.pm Module for Building Web Pages
LWP::UserAgent and Web Site Testing
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