@DFGray wrote:
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So how do LabVIEW classes help? They can eliminate one or both levels of these case structures through the use of dynamic dispatch. This is done as follows. A parent class is created that is a generic command. It has commands for each state. For each actual command, a class is derived from the parent class. There are VIs in the specific command class for each state. A command is generated by creating the correct object for the current state, then calling the parent class command. Dynamic dispatch will execute the code for the correct command. The command execution loop is then reduced to a single command VI which dynamically dispatches based on the actual command and the current state.
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These days, recertifying for CLA is a short exam. Prior to that I had to take the whole exam overa again for each recert. The last time I sat for the recert, I used exactly that approach where the behaviour was dicated by which dynamic dispatch ws used. The code fell together so quickly and easily that it hadly looked like the code did waht the exam expected!
Since it ws a CLA exam, I just had to specify the clases their children and the over-ride VI to hande the exceptions.
I BELIEVE it was the only LVOOP solution ever accepted for a CLA recert (since then the recert test has chaned).
Ben
