> (union and bit mapping) An archaism of C that remains 
> because old *nix programs use or used them.

>Legacy of the era of expensive RAM.


Those days are long gone. There is someone in the chrome browser group who is 
just now complaining that he has exceeded 70GB ram (yes, ram). For me, GMAIL in 
chrome sucks up almost 1 GB after a couple days.
 > And for mapping variant record types.  Would SMF data be a good example?


Unions for SMF would be a bad idea if you could get them to work because 
variables for all SMF record types can be used at any time. Additionally, SMF 
data can have multiple segments. I think there is an offset variable for each 
segment. Since these are stacked, a pointer to the structure would be the 
logical choice.

Jon.  

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