:- object(object,
imports(category)).
:- info([
version is 3.0,
author is 'Paulo Moura',
date is 2007/06/11,
comment is 'Example object for benchmarking library predicate calls and imported category predicate calls.']).
:- public(length/2).
length(List, Length) :-
length(List, 0, Length).
length([], Length, Length).
length([_| Tail], Acc, Length) :-
Acc2 is Acc + 1,
length(Tail, Acc2, Length).
:- public(ctg_self/0).
% call an imported category predicate by sending a message to self;
% performance will depend on the distance between "self" and "this"
% (always uses dynamic binding)
ctg_self :-
::ctg_pred.
:- public(ctg_direct/0).
% call an imported category predicate directly by using the :/1 control construct;
% (static binding may be used, depending on how the category is compiled)
ctg_direct :-
:ctg_pred.
:- public(obj_local/0).
% call a local object predicate directly; used for comparing performance with
% calls to category predicates using the ::/1 and :/1 control constructs
obj_local :-
{generate_list(20, List)},
length(List, _).
:- end_object.
:- object(descendant,
extends(object)).
version is 1.0,
date is 2007/04/17,
comment is 'Example object used for simulating a small hierarchy.']).
:- object(leaf,
extends(descendant)).
