Solved

Unions?

Posted on 1998-06-10
10
373 Views
Last Modified: 2010-05-03
Union is not possible in Visual Basic, I think, how do you get around this then?
0
Comment
Question by:k_chen
10 Comments
 
LVL 4

Expert Comment

by:zsi
ID: 1463010
Strike.
0
 

Author Comment

by:k_chen
ID: 1463011
Please, serious answers please.
0
 
LVL 6

Expert Comment

by:clifABB
ID: 1463012
The closest thing we have to unions is the user defined type.  Kind of like saying the closest we have to a battleship is a rubber duck.

Sorry, humour goes with the territory.
0
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

 
LVL 6

Expert Comment

by:clifABB
ID: 1463013
In C++:
Union {
float f;
int n;
} UDF

In VB:
Type UDF
  f As Single
  n As Integer
End Type
0
 
LVL 6

Expert Comment

by:clifABB
ID: 1463014
Also, unnamed UDTs are not allowed.
0
 
LVL 1

Expert Comment

by:JayMerritt
ID: 1463015
Could you be referring to UNION not existing in Access SQL?
0
 

Author Comment

by:k_chen
ID: 1463016
I'm referring to union as how ClifABB described it in C++. Not the SQL command. Another question on Visual Basic's flaw. I don't think it's possible to declare constants in Type Declartion, is it?
0
 
LVL 6

Accepted Solution

by:
clifABB earned 40 total points
ID: 1463017
You are absolutely correct.  Constants aren't allowed in UDTs.

Why did you reject my answer?  It is correct.  (It wasn't the rubber duck joke, was it?)

Perhaps it was an oversight so I will submit this as an answer.
0
 
LVL 6

Expert Comment

by:clifABB
ID: 1463018
By the way...
I've been pondering this all night.  Why would anyone want to declare a constant in a union, struct, or UDT?  It's a very inefficient use of memory.  Every time you construct using the union you would be creating a new copy of the constant, when a single constant, declared globally, would be much more efficient.
0
 

Author Comment

by:k_chen
ID: 1463019
I think the point of having a constant in a UDT is to encapsulate     data objects. You're right, it does not have any merit from efficiency point of view.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction I needed to skip over some file processing within a For...Next loop in some old production code and wished that VB (classic) had a statement that would drop down to the end of the current iteration, bypassing the statements that were c…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question