Re: [classad-users] Constraint Question

[Alain Roy <roy@xxxxxxxxxxx>]

At 03:44 PM 1/18/2006 -0600, Marvin Solomon wrote:


> Alain Roy wrote:
> > You're mixing syntax for old and new ClassAds, but yes. In new
> > ClassAds, you can write:
> >
> > Requirements = A isnt defined && B is undefined;
>
> I think you meant
>     Requirements = other.A isnt undefined && other.B is undefined;
Oops, you're right.

> Better still, how about a function atributes(Expr) that returns all the
> attribute names as a list of strings?  You could use the existing function
> size() to find out how many.
>
>     Requirements = other.A isnt undefined && size(attributes(other)) == 1;
Better yet, we can use:

  Requirements = other.A isnt undefined and size(other) == 1

We already defined size() for a ClassAd to return the number of 
attributes, and it's implemented in the C++ version for sure. I had 
simply forgotten we did this.
-alain