Helfer Swipool

Jan Burse, erstellt 15. Sep 2018
/**
* Balanced execution of pool extraction.
* SWI-Prolog version.
*
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
*
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
*
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
*
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
*
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
:- use_module('../compat/swidistributed').
:- use_module('../compat/swiclean').
/*****************************************************************/
/* Normal Test Cases */
/*****************************************************************/
pool :-
create, remove(X), collatz(X, _).
pool2 :-
create, horde((remove(X), collatz(X, _)), 2).
pool4 :-
create, horde((remove(X), collatz(X, _)), 4).
pool8 :-
create, horde((remove(X), collatz(X, _)), 8).
gotcha :-
once((create, remove(X), collatz(X, _), X = 16666)).
gotcha2 :-
once((create, horde((remove(X), collatz(X, _), X = 16666), 2))).
gotcha4 :-
once((create, horde((remove(X), collatz(X, _), X = 16666), 4))).
gotcha8 :-
once((create, horde((remove(X), collatz(X, _), X = 16666), 8))).
/*****************************************************************/
/* Pool Creation */
/*****************************************************************/
:- dynamic pool/2.
:- dynamic subpool/3.
% create
create :-
call_cleanup(
sys_setup_create,
sys_fini_create).
% sys_setup_create
% Leave a choice point!
sys_setup_create :-
between(454, 909, Y),
A is Y // 22,
B is Y rem 22,
assertz(pool(A, B)),
fail.
sys_setup_create :-
between(10000, 20000, X),
Y is X // 22,
C is X rem 22,
A is Y // 22,
B is Y rem 22,
assertz(subpool(A, B, C)),
fail.
sys_setup_create.
sys_setup_create :- fail.
% sys_fini_create
sys_fini_create :-
retractall(pool(_,_)),
retractall(subpool(_,_,_)).
% remove(-Integer)
remove(X) :-
retract_alt(pool(A, B)),
Y is A * 22 + B,
retract_alt(subpool(A, B, C)),
X is Y * 22 + C.
% retract_alt(+Head)
retract_alt(H) :-
clause(H, true, R), erase(R).

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