ask_question/5 — Logtalk 3.100.1

built-in method

# `ask_question/5`

## Description

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

Built-in method for asking a question represented by a term, `Question`, which is converted to the question text using the logtalk::message_tokens(Question, Component) 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 logtalk::question_prompt_stream(Kind, Component, Prompt, Stream) hook predicate. The `Check` argument is a 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 check goal succeeds.

This predicate starts by calling the logtalk::question_hook(Question, Kind, Component, Tokens, Check, Answer) 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),
    ...

See also

question_hook/6, question_prompt_stream/4, message_hook/4, message_prefix_stream/4, message_tokens//2, print_message/3, print_message_tokens/3, print_message_token/4