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This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2023 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0

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(persistency(loader)). ... yes

% no initial state:

| ?- persistency::state(S). no

% add some terms:

| ?- persistency::add(a). yes

| ?- persistency::add(b). true.

% enumerate current terms:

| ?- persistency::state(S). S = a ; S = b ; no

% save the terms to permanent storage:

| ?- persistency::save. yes

% halt the process:

| ?- halt.

% restart Logtalk and reload:

| ?- logtalk_load(persistency(loader)). ... yes

% enumerate current terms:

| ?- persistency::state(S). S = a ; S = b ; no

% add another term:

| ?- persistency::add(c). yes

% save the terms to permanent storage:

| ?- persistency::save. yes

% halt the process:

| ?- halt.

% restart Logtalk and reload:

| ?- logtalk_load(persistency(loader)). ... yes

% enumerate current terms:

| ?- persistency::state(S). S = a ; S = b ; S = c ; no