Re: C like Data Structure Definitions?

[Evan Harris <spanner@xxxxxxxxxx>]

Jim

If your intent is to make sure all the structures have the same structure 
(sorry I couldn't resist :) would externally defining it meet your need ?

In the case that you needed to change the structure you would modify just 
have to modify the external definition then recompile all the programs with 
data structures referencing it. No maintenance of individual data 
structures - and if needed you could use the prefix keyword to 
differentiate structures referencing the the same external definition in 
your programs.

HTH
Evan Harris


>In the C language,  you can create a data structure, called a
>structure, then declare variables to use this structure.  Something
>like:
>
>Struct  MyStruct {
>    Int      MyInt;
>    Long     MyLongInt;
>    Char[10] MyString;
>    };
>
>MyStruct MyNewStruct;
>MyStruct MyNewStruct2;
>
>(I may have the syntax wrong on that last one, it might be
>Struct MyStruct MyNewStruct; )
>
>which means I now have two structures, MyNewStruct and MyNewStruct2 with
>the same definitions.  I want to do something similar in RPG, can I?
>
>I am using in a copy source a data structure called RNF_Data.
>
>D RNF_Data        DS
>D  NetType                       1A   Inz( *Loval )
>D  NetFile                      10A   Inz( *Loval )
>D  NetLib                       10A   Inz( *Loval )
>D  NetNumber                    10U 0 Inz( 0 )
>D                               95A   Inz( *LoVal )
>
>I tried, in my RPG module, to do this, but to no avail:
>
>D Data            DS                  Like(RNF_Data)
>
>which wouldn't even let me type that in (Like not allowed on DS line)
>
>how can I do what I want to do without having to declare this same structure
>twice?  I do not want RNF_Data to be a public variable.  I want to have 2,
>or more, different structures with the same structure type.  Neither will
>be visible to the other (one in my module, one in my program).
>
>Regards,
>
>Jim Langston
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