2 Data Structures over same fields

["Jon Paris" <Jon.Paris@xxxxxxxxxxxxxx>]

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 >> From your example I deduce that you're trying to name fields in one
datastructure the same as another.

Well it may not do what he wants, but as of V5 you can indeed have two DS
fields with the same name.  They do of course represent different pieces of
memory and therefore have different content.  If you use the definitions
below together with the Based keyword, they can share the same memory
space - but I'm not sure why you'd want to.

It would be really nice if RPG had an equivalent to COBOL's Move
Corresponding (but with simpler rules!).  Anyway the following is just fine
in V5 and is the first step in allowing RPGers to define their own data
types.

Like this:

     D ShipTo          DS                  Qualified
     D   CompanyName                 30
     D   Street                      30
     D   City                        30
     D   State                        2
     D   Zip                          5S 0
     D   ZipPlus                      4S 0

     D InvoiceTo       DS                  Qualified
     D   CompanyName                 30
     D   Street                      30
     D   City                        30
     D   State                        2
     D   Zip                          5S 0
     D   ZipPlus                      4S 0

      * If all fields are to be the same then you can use LikeDS like so:
     D Invoice         DS                  LikeDS(ShipTo)

     C                   If        ShipTo.CompanyName = *Blanks
     C                   Eval      ShipTo.CompanyName =
InvoiceTo.CompanyName
     C                   EndIf

     C                   If        ShipTo.CompanyName = *Blanks
     C                   Eval      ShipTo.CompanyName = Invoice.CompanyName
     C                   EndIf


Jon Paris
Partner400




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