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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(birthdays(loader)). ...

% create two new agents, Paul and Nathalie:

| ?- agent::(new(paul, 40, male), new(nathalie, 32, female)).

yes

% make them friends:

| ?- paul::new_friend(nathalie).

yes

% turn event support on for messages sent at the command-line % (i.e., for messages sent from the pseudo-object "user"):

| ?- set_logtalk_flag(events, allow).

yes

% it's birthday for Nathalie:

| ?- nathalie::birthday.

Happy birthday from paul! Thanks! Here, have a slice of cake, paul. Thanks for the cake nathalie! Say goodbye to your 32's! yes

% ask Nathalie her age:

| ?- nathalie::age(Age).

Age = 33 yes

% a year goes by...

| ?- nathalie::birthday.

Happy birthday from paul! Thanks! Here, have a slice of cake, paul. Thanks for the cake nathalie! Say goodbye to your 33's! yes

% turn event support off:

| ?- set_logtalk_flag(events, deny).

yes