
copy_term_vars(?Vars, ?OldTerm, -NewTerm)

   NewTerm gets unified with a variant of OldTerm where all occurrences
of variables in Vars are replaced by fresh variables.



Arguments
   Vars                Prolog term, usually a variable or a list of variables.
   OldTerm             Prolog term.
   NewTerm             Prolog term.

Type
   Term Manipulation

Description
   A copy of OldTerm is created, ie. a term that is similar to OldTerm but
   all occurrences of the variables mentioned in Vars have been replaced
   by new variables which do not occur elsewhere.


   Metaterms are treated like normal variables. Their attributes are
   copied as specified by the corresponding copy_term handler.


   Subterms that do not contain any of the variables to replace are
   not physically copied.


   Note that when the structure of the term to be copied is known, then
   it is more efficient to use specialised unification code to do the job.




Modes and Determinism
   copy_term_vars(?, ?, -) is det

Examples
      [eclipse]: Term=s(X,Y,Z), copy_term_vars(Y, Term, Copy).
   X = _79
   Z = _81
   Y = _60
   Term = s(_79, _60, _81)
   Copy = s(_79, _120, _81)
   yes.





See Also
   copy_term / 2, copy_term / 3, variant / 2, functor / 3, term_variables / 2
