Identity lists

Author(s): Francisco Bueno.

The operations in this module handle lists by performing equality checks via identity instead of unification.

Usage and interface

Documentation on exports

PREDICATE
member_0(X,Xs)

True iff memberchk/2 is true.

PREDICATE
memberchk(X,Xs)

Checks that X is an element of (list) Xs.

PREDICATE

Usage: list_insert(List,Term)

  • Description: Adds Term to the end of (tail-opened) List if there is not an element in List identical to Term.
  • The following properties should hold at call time:
    (term_typing:var/1)List is a free variable.
    (term_typing:nonvar/1)Term is currently a term which is not a free variable.

PREDICATE

Usage: add_after(L0,E0,E,L)

  • Description: Adds element E after the first element identical to E0 (or at end) of list L0, returning in L the new list.
  • The following properties should hold at call time:
    (term_typing:nonvar/1)L0 is currently a term which is not a free variable.
    (term_typing:nonvar/1)E0 is currently a term which is not a free variable.
    (term_typing:nonvar/1)E is currently a term which is not a free variable.
    (term_typing:var/1)L is a free variable.

PREDICATE

Usage: add_before(L0,E0,E,L)

  • Description: Adds element E before the first element identical to E0 (or at start) of list L0, returning in L the new list.
  • The following properties should hold at call time:
    (term_typing:nonvar/1)L0 is currently a term which is not a free variable.
    (term_typing:nonvar/1)E0 is currently a term which is not a free variable.
    (term_typing:nonvar/1)E is currently a term which is not a free variable.
    (term_typing:var/1)L is a free variable.

PREDICATE

Usage: delete(List,Element,Rest)

  • Description: Rest has the same elements of List except for all the occurrences of elements identical to Element.
  • The following properties should hold at call time:
    (term_typing:nonvar/1)List is currently a term which is not a free variable.
    (term_typing:nonvar/1)Element is currently a term which is not a free variable.
    (term_typing:var/1)Rest is a free variable.

PREDICATE

Usage: subtract(Set,Set0,Difference)

  • Description: Difference has the same elements of Set except those which have an identical occurrence in Set0.
  • The following properties should hold at call time:
    (term_typing:nonvar/1)Set is currently a term which is not a free variable.
    (term_typing:nonvar/1)Set0 is currently a term which is not a free variable.
    (term_typing:var/1)Difference is a free variable.

PREDICATE

Usage: union_idlists(List1,List2,List)

  • Description: List has the elements which are in List1 but are not identical to an element in List2 followed by the elements in List2.
  • The following properties should hold at call time:
    (term_typing:nonvar/1)List1 is currently a term which is not a free variable.
    (term_typing:nonvar/1)List2 is currently a term which is not a free variable.
    (term_typing:var/1)List is a free variable.