=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.21.4

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
=================================================================


% start by loading the example:

| ?- logtalk_load(loader).
...


% set a point in the space-time:

| ?- space_time::rotate(1, 2, 3).
yes

| ?- space_time::translate(4).
yes


% verify it:

| ?- space_time::xyzt(X, Y, Z, T).

T = 4,
X = 1,
Y = 2,
Z = 3 ? 
yes


% enumerate space_time public predicates:

| ?- space_time::(current_predicate(Functor/Arity), functor(Pred, Functor, Arity), predicate_property(Pred, declared_in(Object))).

Pred = xyzt(_A,_B,_C,_D),
Arity = 4,
Object = space_time,
Functor = xyzt ? ;

Pred = xyz(_A,_B,_C),
Arity = 3,
Object = space,
Functor = xyz ? ;

Pred = rotate(_A,_B,_C),
Arity = 3,
Object = space,
Functor = rotate ? ;

Pred = t(_A),
Arity = 1,
Object = time,
Functor = t ? ;

Pred = translate(_A),
Arity = 1,
Object = time,
Functor = translate ? ;

no



% get the origin distance from a point in the space-time(_, _, _, _):

| ?- space_time(2,3,4,7)::distance(D).

D = 5.385164807134504 ? 
yes

| ?- space_time(2,3,4,7)::time(T).

T = 7 ? 
yes


% enumerate space_time(_, _, _, _) public predicates:

| ?- space_time(2,3,4,7)::(current_predicate(Functor/Arity), functor(Pred, Functor, Arity), predicate_property(Pred, declared_in(Object))).

Pred = distance(_A),
Arity = 1,
Object = space(_B,_C,_D),
Functor = distance ? ;

Pred = time(_A),
Arity = 1,
Object = time(_B),
Functor = time ? ;

no