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   ► KBDesktop Data...Access & VBAAccess VBAOOP   Print This     
 
Access OOP:
Access VBA Destructor
 
Posted 11 years ago on 1/18/2009
Access Code Snippet:
 A flashcard from our Access Flashcards Library
 A code snippet from our Access Code Snippets Page

KB101832

General Info: Class Destructor

A special class method called when an object instance of a class is destroyed. With some languages they are called when the object instance goes out of scope, with some languages you specifically have to call the destructor in code to destroy the object, and others use a garbage collector to dispose of object instances at specific times.

Desctructors are commonly used to free the object instance but with languages that have a garbage collector object instances are disposed of when appropriate. Either way, destructors or their equivalent are commonly used to free up resources allocated in the class constructor.

Languages Focus: Destructor

Are object instances freed with a garbage collector? Or, do you have to destroy object instances.

Access VBA Destructor

When an object instance is destroyed, Access VBA calls a special parameter-less sub named Class_Terminate. For example, when the variable falls out of scope. Since you cannot specify parameters for this sub, you also cannot overload it.

To explicitly destroy an object, use Set YourClass = nothing.

When an object instance is created from a class, Access VBA calls a special sub called Class_Initialize.

More Info

Definition:  Class Destructor

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Code 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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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Advanced

1 Advanced Level Question

Question #1: Multiple Choice

In Access object oriented programming, when an object instance is destroyed, Access VBA calls a special parameter-less sub named what?

Answer:
1. 

Class_Destroy

2. 

Class_Free

3. 

Object_Destroy

4. 

Class_Terminate

5. 

Object_Terminate


 KB Article #101832 Counter
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Since 1/18/2009
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