.. This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2024 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.

.. rst-class:: align-right

built-in method

.. index:: pair: ask_question/5; Built-in method .. _methods_ask_question_5:

ask_question/5

Description

::

ask_question(Question, Kind, Component, Check, Answer)

Built-in method for asking a question represented by a term, Question, which is converted to the question text using the :ref:`logtalk::message_tokens(Question, Component) <methods_message_tokens_2>` hook predicate. This method is declared in the logtalk built-in object as a public predicate. The default question prompt and the input stream used for each Kind-Component pair can be found using the :ref:`logtalk::question_prompt_stream(Kind, Component, Prompt, Stream) <methods_question_prompt_stream_4>` hook predicate. The Check argument is a :term:closure that is converted into a checking goal by extending it with the user supplied answer. This predicate implements a read-loop that terminates when the checking predicate succeeds.

This predicate starts by calling the :ref:`logtalk::question_hook(Question, Kind, Component, Check, Answer) <methods_question_hook_6>` hook predicate. If this predicate succeeds, the ask_question/5 predicate assumes that the question have been successfully asked and replied.

Modes and number of proofs

::

ask_question(+nonvar, +nonvar, +nonvar, +callable, -term) - one

Meta-predicate template

::

ask_question(*, *, *, 1, *)

Errors

(none)

Examples

::

..., logtalk::ask_question(enter_age, question, my_app, integer, Age), ...

.. seealso::

:ref:methods_question_hook_6, :ref:methods_question_prompt_stream_4, :ref:methods_message_hook_4, :ref:methods_message_prefix_stream_4, :ref:methods_message_tokens_2, :ref:methods_print_message_3, :ref:methods_print_message_tokens_3, :ref:methods_print_message_token_4