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Status Future consideration
Workspace IBM i
Categories Languages - RPG
Created by Guest
Created on Nov 2, 2022

Allow data structures to be extended or decorated

RPG currently allows us to define a data structure with the same layout another with the LIKEDS keyword.

It would be useful to be able to use a similar keyword to define the basic structure, but also to extend the data structure and add additional subfields to the end.

This would allow developers to have a base type that defines an archetype - e.g. a person that is then extended by other specialisations which have additional properties specific to them - e.g. employee, manager, customer..

In the examples below I have used 'extends' as the keyword.

dcl-ds person_t qualified template;
firstName char(30);
surname char(30);
dob date;
address likeDs(address_t)
end-ds;

// The employee_t data structure is a specialisation of the person_t structure, adding some extra fields.
dcl-ds employee_t extends(person_t) template;
employeeNumber int(10);
departmentCode char(2);
end-ds;

// The employee_t data structure can itself be extended:
dcl-ds manager_t extends(employee_t) template;
authorisationLimit packed(15:2);
end-ds;

// The customer_t data structure is another specialisation of person_t, adding some other extra fields
dcl-ds customer_t extends(person_t) template;
customerNumber int(10);
emailAddress char(128);
registrationDate date;
end-ds;
Idea priority Medium
  • Guest
    Nov 9, 2022
    IBM will use this Idea as input to planning, but no commitment is made or implied. This Idea will be updated in the future if IBM implements it. IBM will use votes and comments from others in the community to help prioritize this Idea.

    - IBM Power Systems Development