cuts of backtracking
integer(BackTrackPoint) (i) A value obtained by getbacktrack.
Together with getbacktrack () this
predicate may be used to effect backtracking. Its effect is, that when backtracking
takes place back to the cutbacktrack() goal, the execution flow takes a short-cut
back to the position where the associated getbacktrack() goal was done.
Instead of using getbacktrack() and cutbacktrack() you may also use set_cut () and cut () to achieve the same purpose. set_cut()/cut() are more comfortable in a way that you may use virtual handle, but they work sufficiently slower.
repeat, getbacktrack(BTP), for(1,5,X), write(X), X = 3, cutbacktrack(BTP), fail.
This will cause the following output: 123123123 ...
A runtime error occurs if BackTrackPoint is invalid. However, misuse may crash the system.
prolog-process, client-server, object
! , set_cut , cut , getbacktrack