[gecode-users] Views and serialization

[Guido Tack]

Gustavo Gutierrez wrote:

> I have a question about the VarMap or VarMapIter. Is it possible to
> know how many variables a VarMap stores, or to access VarBase objects
> through VarMapIter?

No, that functionality was missing.  It's now available in the Gecode  
trunk.

> .  My idea is to iterate on the VarMap and to add
> the VarBase corresponding objects to the q array. The problem is that
> i don't find a method to get the size of the map to use it in a for
> loop. The VarMapIter only provides access to variable specifications
> but not to VarBase objects.

With the added size method, you can implement the iteration yourself  
(using the VarBase* var(int i) const; method).  If you not only want  
to fill an array of VarBase*, but an array of IntVars, BoolVars, or  
SetVars, you'll have to cast the VarBase* to the corresponding  
variable type.  You can do that through the views:

IntVar iv(Int::IntView(static_cast<Int::IntVarImp*>(vm.var(0))))
would create an IntVar from entry 0 of the VarMap vm.  You can use the  
VarSpec to query the variable type.  Currently, vm.spec(0).vti() may  
return "VTI_INT", "VTI_BOOL", or "VTI_SET".

Cheers,
	Guido

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