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   ► KBRole-Based T...Coding & OOGeneral Codi...   Print This     
  From the January 2010 Issue of Prestwood eMag
 
Coder General Coding Concepts:
Overloading
 
Posted 13 years ago on 10/30/2008 and updated 2/13/2009
Take Away:

Types of overloading include method overloading and operator overloading.

Method Overloading is where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism.

Operater Overloading allows an operator to behave differently based on the types of values used. For example, in some languages the + operator is used both to add numbers and to concatenate strings. Custom operator overloading is sometimes referred to as ad-hoc polymorphism.

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KB101457

Overloading -

Types of overloading include method overloading and operator overloading.

Method Overloading is where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism.

Operater Overloading allows an operator to behave differently based on the types of values used. For example, in some languages the + operator is used both to add numbers and to concatenate strings. Custom operator overloading is sometimes referred to as ad-hoc polymorphism.


When to Overload

Consider overloading a method when several methods conceptually do the same thing but require a different number and/or different parameter types. Do not use overloading when two methods do conceptually diffrent things.

Method Overloading

Where different functions with the same name are invoked based on the data types of the parameters passed or the number of parameters. In various languages you can overload functions, procedures, constructors, and destructors. Method overloading is a type of polymorphism and is also known as Parametric Polymorphism.

Operater Overloading

Allows an operator to behave differently based on the types of values used. For example, in some languages the + operator is used both to add numbers (2+2=4) and to concatenate strings ("Mike" + " " + "Prestwood"="Mike Prestwood"). If a language supports developer defined operator overloading, then your custom operator overloading is sometimes referred to as ad-hoc polymorphism.

More Info

Code:  ASP Classic Overloading (Not Supported)
Code:  C# Overloading (implicit)
Code:  C++ Overloading
Code:  Delphi Overloading (overload)
Code:  Delphi Prism Overloading (implicit)
Code:  Java Overloading
Code:  JavaScript Overloading
Code:  ObjectPAL Overloading
Code:  Perl Overloading
Code:  PHP Overloading
Code:  VB Classic Overloading (Not Supported)
Code:  VB.Net Overloading (Overloads, or implicit)

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Definition Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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