Re: V5 - RPG announcements?

David wrote:
>On Wed, 25 Apr 2001 boldt@ca.ibm.com wrote:
>> A related enhancement that you should get to know very well as you
>> learn V5R1 is keyword LIKEDS.  A data structure or procedure
>> parameter defined with LIKEDS inherits all the subfields of the
>> other data structure.  So you can define data structure A as
>> qualified with subfield X and data structure B as LIKEDS(A) with no
>> subfields, and you can refer to subfields A.X and B.X.  The
>> advantages of LIKEDS used with procedure parameters should be
>> obvious.
>
>Is this the same as:
>
>typedef struct {
>char *string;
>int number;
>(etc)
>} mytype;
>
>mytype myDS;
>
>in C?

Hmmm, let's see if I can be more specific:  The
V5R1 RPG IV code:

--------------------------------------------------
D a               ds                  qualified
D   x                           10i 0
D b               ds                  likeds(a)
--------------------------------------------------

would be equivalent to the C code:

--------------------------------------------------
struct a_struct {
   int x;
} a;
struct a_struct b;
--------------------------------------------------

In both cases, you'd refer to variables "a.x" and
"b.x".

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com

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