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During my time at NI Week I decided to bring my video camera and record the presentations, Tech Theater and LAVA BBQ. Please see this link for Video downloads The IT department of my company was also kind enough to setup a ftp server so I could share them with the community It took a while to figure out how to compress the 5GB HD .mts files to a more distributable avi format but with the help of crelf I finally got them compressed and uploaded to the ftp sites. Vi Engineering and Distek Integration have also volunteered their ftp servers to help distribute the videos Thank you Chris and Ed for your help. The avi files can be downloaded from one of the 3 ftp sites they range in size from 150 to 300MB. I would strongly recomend using an ftp client to transfer them to your computer. A web browser may work but if you want to download multiple viedos the ftp client makes things much easier. To download videos from Distek they are requiring you to use an ftp client. My ftp client of choise is FileZilla and it is free. FileZilla can be downloaded at http://filezilla-project.org/ If you are unfamiliar with FileZilla there is a youtube tutorial video found here The video files are .avi and have been compressed using DivX If you player isn't able to play the videos you will need to install the free DivX codec found at http://www.divx.com/...plus/codec-pack to access the videos via Use this log in information ftp://frc.tecnova.com login: LabVIEW_Videos pw: LabVIEW login and password is case sensitive. if you are using Filezilla your site manager window will look like this. For Use this log in information ftp://tahoe.viengineering.net login: LabVIEW_Videos pw: LabVIEW login and password is case sensitive. if you are using Filezilla your site manager window will look like this. For Username: NIWeek2012 Password: f7aPadl6 Please Note: You will not be able to access the FTP through a web browser! You MUST use an FTP Software Client to access the FTP. To access the ftp.distek.com please use your FTP software client: Client FTPS settings Hostname: ftp.distek.com Port: 990 Client Settings for SFTP using ssh ftp.distek.com Port 22 if you are using Filezilla your site manager window will look like this. If you have any issues downloading the videos or you are unable to view them please post to this topic. Enjoy, and hopfully the videos will help you learn something new about LabVIEW Mark

I think this may be your problem. I'd tackle it like so: class SpectrumData{ public virtual DoSomething();}// Each type inherits from the SpectrumData classclass FAT : SpectrumData{ // Implement the must-override public DoSomething();}// Other implementations...class FAT2 : SpectrumData;class GAG : SpectrumData;class STA : SpectrumData;class RDB : SpectrumData;// Note no inheritanceclass SpectrumData_TAG{ SpectrumData Data; DoSomething();}SpectrumData_TAG::DoSomething(){ // The TAG class delegates to the appropriate implementation of the contained type. Data.DoSomething();} That is the TAG class wouldn't share the same ancestor as each individual type. I'm assuming there's a good reason you're looking to preserve this union-like behavior.

Why are classes D and E not children of C, if they are to use C’s method?

The questions being asked here are exactly the same questions asked at NI when DAQmx was designed. There were many debates over the trade offs of which way to slice functionality for max polymorphism (which has user advantage insofar as lots of measurements have a similar API) and what to make runtime vs compile-time errors. You see the result. If you're trying to write a *general* OO wrapper, I bet your wrapper will just trade one set of issues for another. But if you design an app-specific API to wrap DAQmx, I know you can put a much easier to use API into place... I know because I've seen users do it.

I disagree with Darin a little...I think there are valid times when you should comment on what the code is doing. Sometimes what may be self documenting to you is not as self documenting to others. I run into this commonly with bit manipulations and bitwise functions, and lately even more so with FPGA. Often times if someone just left a comment "this checks if bit 4 changed" I would understand quickly vs. trying to read the ands and ors and scale by power of 2's that my mind doesn't yet process as easily. Maybe this is my own shortcoming, but I still think it's worth noting. The problem is at what point do you determine whether something is self documenting in general and the majority of programmers would agree that it is, or whether it's self documenting just for yourself (code reviews, anyone?). I find myself looking at my own code and thinking "that makes sense" but forgetting that it took me 3 hours to get it to work. Anyways, this is just one example and I think touches on the same thing Cat is saying above. One thing I am always sure to document is the random "increment" or "decrement" function. C'mon, we've all seen this, the code works, yet we wonder wth is that there for!