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Status Not under consideration
Workspace IBM i
Categories Languages - RPG
Created by Guest
Created on Mar 19, 2025

Provide a smart LIKE keyword that works with any target type (vs LIKE and LIKEDS)

Today when we write code, we use the LIKEDS (mostly) to declare a data structure "like" another.

When a field is declared and should be "like" another existing field, we use the LIKE keyword.

Please provide a new keyword that can be used in either context so we can simply say "LIKE(vartemplate)" instead of having to determine if the referred variable is a data structure or a field.

Why? Because when generating code or copying code, we shouldn't have the extra burden of figuring out if the referenced variable is a structure or a field.

I suggest a new keyword, let's call it TYPE, that would do what I'm asking. Here's an example:

  dcl-s size_t uns(10);
  dcl-s ptr  pointer;
   dcl-ds Qdb_Mbrd0100_T  Qualified Inz TEMPLATE; 
   Bytes_Returned INT(10);                      
   Bytes_Available INT(10);                     
   Db_File_Name CHAR(10);                       
   Db_File_Lib CHAR(10);                        
   Member_Name CHAR(10);                        
   File_Attr CHAR(10);                          
   Src_Type CHAR(10);                           
   Crt_Date CHAR(13);                           
   Change_Date CHAR(13);                        
   Text_Desc CHAR(50);                          
   Src_File CHAR(1);                            
 end-ds;  // Qdb_Mbrd0100_T     
 
 dcl-s rtnLen type(size_t);
 dcl-s pMbrD  type(ptr);
 dcl-ds mbrDesc type( Qdb_Mbrd0100_T );
 dcl-s length type(*INT);
 dcl-s smallSize type(*int2);

 

The definitions of the fields RTNLEN, PMBRD, and MBRDESC are all based on other fields.

There could also be pre-defined types, to make things in routines consistent. For example *INT4, *INT2, *UINT2, *UINT4, etc. I suppose if TYPE(*CHAR) is specified, then LEN(nn) would be required to.                                      

Idea priority High
  • Guest
    May 20, 2025
    Thank you for taking the time to submit your Idea. However, IBM does not intend to provide a solution to this Idea at this time, so it is being closed.

    The extra information provided by the use of the specific LIKE or LIKEDS keyword would be useful for programmers using those fields, although for variable definitions, that extra information is also provided by either "DCL-S" or "DCL-DS". However for parameter definitions, the difference between LIKE and LIKEDS is crucial for any programmer working with the procedure.

    -IBM Power Systems Development
  • Guest
    May 5, 2025

    In fact, the LIKEDS keyword is a bit redundant:

    dcl-ds XXX likeds(YYY);


    It's clear that the definition should create a data structure, due to the dcl-ds statement - so it's also clear, that a like(...) would reference to another data structure.

    But I don't think, that a combination of type keyword and like keyword would be good. It should be clear, that the definition it either "original" or "based on another".