Re: [Vala] Setting and getting properties at the same time

[Nor Jaidi Tuah <norjaidi tuah ubd edu bn>]

Not surprisingly, the very subtle point raised by
the original poster has been misunderstood.

The OP complained that this

   int x = (myclass.myproperty = y);

should behave like this

   // Semantic A
   myclass.myproperty = y;
   int x = myclass.property;

rather than this

   // Semantic B
   myclass.myproperty = y;
   int x = y;

The subtle point is that myclass.myproperty
does not necessarily evaluate to y.
To repeat the OP's example, a property can
be defined like this

     private int _number;
     public int number {
        set { _number = value * 2; }
        get { return _number; }
     }

I think chained assignment should have
Semantic B, for the following reasons:

  * A well designed property should give
    the same result for both semantics

  * Semantic A is not possible for a
    write only property.

  * Semantic A is really confusing. e.g.,
      var1.myproperty = var2.myproperty = y;
    who would have thought that var1.myproperty
    is different from var2.myproperty ?!


hand
Nor Jaidi Tuah




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