Modul State

Jan Burse, erstellt 20. Okt 2018
/**
* This module provides trailed named values.
*
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* 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.
*
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*
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*
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* 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.
*
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*/
:- package(library(jekmin/reference/term)).
:- module(state, []).
:- use_module(library(experiment/trail)).
:- use_module(library(minimal/assume)).
:- use_module(library(experiment/ref)).
:- private state/2.
:- thread_local state/2.
/**************************************************************/
/* Trailed Shared */
/**************************************************************/
/**
* b_setval(K, W):
* The predicate assigns the value W to the key K.
* The assignment is automatically undone upon backtracking.
*/
% b_setval(+Term, +Term)
:- public b_setval/2.
b_setval(K, W) :-
H = wrap(W),
/**
* nb_current(K, W):
* The predicate succeeds for the value W of the key K.
*/
% nb_current(-Term, -Term)
:- public nb_current/2.
state(K, F),
sys_melt_var(F, wrap(W)).
/**
* b_delete(K):
* The predicate de-assigns the key K.
* The de-assignment is automatically undone upon backtracking.
*/
% b_delete(+Term)
:- public b_delete/1.
throw(error(instantiation_error,_)).
% b_delete2(+Term)
:- private b_delete2/1.
clause_ref(state(K, _), true, R), !,

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