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Status Delivered
Workspace PL/I Compilers
Created by Guest
Created on Aug 28, 2018

RELATED IDEAS

New value attribute VALUELISTFROM

As a supplement to VALUELIST it might be good to have a new attribute VALUELISTFROM:
VALUELISTFROM( x ) would also specify the allowed values that a variable could hold.
But x is a named constant structure - therefore all their constants (attributes of the named constant structure x) are allowed values.
For example, a function parameter defines their possible and useable functioncodes
dcl 1 function_x_code_values,
2 insert  char(3) value('INS'),
2 delete char(3) value('DEL'),
2 update char(3) value('UPD');
dcl function_x_code  char(3)
   valuelistfrom(function_x_code_values);

Idea priority High
  • Guest
    Reply
    |     Sep 5, 2019

    this is part of the 5.3 release

  • Guest
    Reply
    |     Sep 13, 2018

    this would be useful for the reason stated: it would avoid duplication and reduce the chance for error

  • Guest
    Reply
    |     Aug 30, 2018

    The gain for use was specified at the end of the "use Case"

    With VALUELISTFROM I have to define the valid values only on one place (named constant structure) instead of two places (named constant structure and define alias or valuelist)
    I think that is easier to maintain (less error-prone)

  • Guest
    Reply
    |     Aug 29, 2018

    the rfe does not say what practical gain would be of adding VALUELISTFORM e.g. woud it be used for testing that could not be done by using VALUELIST and dcl function_x_code_values char(3)
    VALUELIST('INS', UPD' , DEL') and validvalue ? If the is goal is getting the value of a variable/constant then how the value is stored in the first place has no relevance.

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