Re: SORTA and Data Structure Arrays

[Scott Klement <klemscot@xxxxxxxxxxxx>]

On Mon, 8 Dec 2003 keblake@xxxxxxxxxxxxxxxxxxx wrote:

> I have an array defined as follows:
[SNIP]
> and I recieve the following compilation error:
> RNF5159: Factor 2 operand must be an array name for specified operation.

Hi,

I don't think you can use SORTA with a qualified data structure.  This is
a perfect use for QSORT, though.  Another advantage of QSORT is that you
won't have to initialize everything to 9999, since QSORT will only sort
the elements you ask it to sort...

What's really nice about qualified structures is that you can define one
as a prototype, and use LIKEDS to make many more copies that are the same
format.  This allows you to pass them as parameters nicely, as well.

Here's some sample code that demonstrates sorting your array with QSORT:

     H DFTACTGRP(*NO) BNDDIR('QC2LE')

     D qsort           PR                  ExtProc('qsort')
     D   base                          *   value
     D   num                         10U 0 value
     D   width                       10U 0 value
     D   compare                       *   procptr value

     D SortByItem      PR            10I 0
     D   parm1                             likeds(Order)
     D   parm2                             likeds(Order)

     D SortByQty       PR            10I 0
     D   parm1                             likeds(Order)
     D   parm2                             likeds(Order)

     D Order           DS                  based(prototype_only)
     D                                     Qualified
     D  DtlItem                      12A
     D  DtlOrdQty                     5S 0

     D Order1          DS                  likeds(Order) dim(99)
     D numitems        s             10I 0

      ** Throw some sample data into array to test it.

     c                   eval      order1(1).DtlItem = 'ZZ123'
     c                   eval      order1(1).DtlOrdQty = 5

     c                   eval      order1(2).DtlItem = 'BB321'
     c                   eval      order1(2).DtlOrdQty = 17

     c                   eval      order1(3).DtlItem = 'RR826'
     c                   eval      order1(3).DtlOrdQty = 14

     c                   eval      order1(4).DtlItem = 'AA000'
     c                   eval      order1(4).DtlOrdQty = 3
     c                   eval      numitems = 4

      ** Sort the array by DtlItem

     c                   callp     qsort(%addr(Order1): numitems:
     c                                %size(Order): %paddr('SORTBYITEM'))

      ** Sort the array by DtlOrdQty

     c                   callp     qsort(%addr(Order1): numitems:
     c                                %size(Order): %paddr('SORTBYQTY'))

     c                   eval      *inlr = *on

      *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
      *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
     P SortByItem      B
     D SortByItem      PI            10I 0
     D   parm1                             likeds(Order)
     D   parm2                             likeds(Order)

     c                   select
     c                   when      parm1.DtlItem < parm2.DtlItem
     c                   return    -1
     c                   when      parm1.DtlItem > parm2.DtlItem
     c                   return    1
     c                   other
     c                   return    0
     c                   endsl

     P                 E


      *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
      *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
     P SortByQty       B
     D SortByQty       PI            10I 0
     D   parm1                             likeds(Order)
     D   parm2                             likeds(Order)

     c                   select
     c                   when      parm1.DtlOrdQty < parm2.DtlOrdQty
     c                   return    -1
     c                   when      parm1.DtlOrdQty > parm2.DtlOrdQty
     c                   return    1
     c                   other
     c                   return    0
     c                   endsl

     P                 E