Mauricio Toro wrote:
> Hello all,
>
> I am doing an application with Gecode using several Spaces.
> I need to copy the domain from IntVars and SetVars from one Space to
> another.
> But, once I copy the domain, the old space is deleted, therefore I
> do not
> want some sort of "channel" constraint.
>
> For example:
>
> Space * space1;
> IntVar x(space1, 1,10);
> IntSet y;
> copythedomain(x,y);
What do you mean here, that the set y should reflect the current
domain of x?
> //do some computation
> delete space1;
> Space * space2;
> IntVar z(space2,1,100);
> copythedomain(z,y);
And now, what should the result be? Do you expect y to be overwritten
with the domain of z, or intersected? Or do you expect z to be
constrained to the value of y? (I guess the latter)
> //do some computation
> delete space2;
>
> I tried with these constraints:
> dom(space1,x,y); dom(space2,z,y);
> But they did not work.
An IntSet is never modified by a call to dom, after all, it's not a
constraint variable! It works exactly the other way around: the
variable domain is constrained to be a subset of the IntSet.
> What can I do?
The code is not tested, but this is approximately how it should work:
void copythedomain(Space* home, IntVar from, IntVar to) {
IntVarRanges fromR(from);
IntSet fromS(fromR);
dom(home, to, fromS);
}
Note that home has to be the space that "to" lives in, and you don't
need the space that "from" lives in.
Cheers,
Guido
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