________________________________________________________________________

This file is part of Logtalk <https://logtalk.org/>  
Copyright 1998-2020 Paulo Moura <pmoura@logtalk.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
________________________________________________________________________


% load the example:

| ?- logtalk_load(ack(loader)).
...


% some example queries for backend Prolog compilers implementing the 
% time/1 timing predicate (e.g. SWI-Prolog or YAP; the adapter files
% for these two systems ensure that a ::/2 goal in the argument of the
% time/1 predicate is compiled prior to calling it):

?- time(true).  % autoload the predicate in the case of SWI-Prolog
true.

?- time(ack::ack(2, 4, V)).
% 98 inferences, 0.00 CPU in 0.00 seconds (0% CPU, Infinite Lips)
V = 11.

?- time(ack::ack(3, 3, V)).
% 2,451 inferences, 0.00 CPU in 0.00 seconds (0% CPU, Infinite Lips)
V = 61.

?- time(ack::ack(3, 4, V)).
% 10,326 inferences, 0.00 CPU in 0.00 seconds (0% CPU, Infinite Lips)
V = 125.


% some example queries for other backend Prolog compilers:

?- ack::ack(2, 4, V).
V = 11
yes

?- ack::ack(3, 3, V).
V = 61
yes

?- ack::ack(3, 4, V).
V = 125
yes
