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  1. OMG Issue

OCL23 — OCL 2.1 11.2.5 Numeric = and <> operations should compare values rather than objects

Open Closed All
  • Key: OCL23-24
  • Legacy Issue Number: 14918
  • Status: closed  
  • Source: Model Driven Solutions ( Dr. Edward Willink)
  • Summary:

    OCLAny::=() is defined as 'True if self is the same object as object2.'

    This is not overloaded for numeric types, and it is not specified that a numeric value may not have multiple instances.

    The definition therefore implies that:

    1 = 1

    may often evaluate to false, and that

    1.0 = 1

    must evaluate to false even though (1.0 <= 1) and (1.0 >= 1) will evaluate true

    Suggest overload

    {Boolean, Real, String}

    ::

    {=,<>}

    to use values rather than objects.
  • Reported: OCL 2.2 — Sat, 2 Jan 2010 05:00 GMT
  • Disposition: Resolved — OCL 2.3
  • Disposition Summary:

    The use of object should be clarified so that
    Class instances are compared by object identity.
    DataType instances are compared by value.
    This resolution overlaps with null/invalid clarification and so the change below includes changes for Issue 18437.
  • Updated: Fri, 6 Mar 2015 20:58 GMT