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el_weight(+Var, ?Wvar)
Var is an element of type e(Val,Weight) from a weighted domain.  Wvar is a
free variable unifying with the weight Weight of Var.
- +Var
- A weighted element.
- ?Wvar
- Term unifying with an integer.
Description
   Unifyes the weight of the term Var which should be of the form
   e(Val,Weight) with Wvar.  This predicate is convenient to select
   elements for the labeling of weighted sets.
Fail Conditions
   Fails if Var is not of the form e(Val,Weight) or if Wvar is not
   unifyable with the weight.
Resatisfiable
   No.
Examples
[eclipse 12]: E = e(1,2), el_weight(E, W).
E = e(1, 2)
W = 2
yes.
See Also
max_weight / 2, `:: / 2