question_hook/6 — Logtalk 3.100.1

built-in method

# `question_hook/6`

## Description

    question_hook(Question, Kind, Component, Tokens, Check, Answer)

User-defined hook method for intercepting asking a question, declared in the logtalk built-in object as a public, multifile, and dynamic predicate. This hook method is automatically called by the ask_question/5 method. When the call succeeds, the `ask_question/5` method assumes that the question have been successfully asked and replied.

## Modes and number of proofs

    question_hook(+nonvar, +nonvar, +nonvar, +list(nonvar), +callable, -term) - zero_or_one

## Meta-predicate template

    question_hook(*, *, *, *, 1, *)

## Errors

(none)

## Examples

    :- multifile(logtalk::question_hook/6).
    :- dynamic(logtalk::question_hook/6).

    % use a pre-defined answer instead of asking the user
    logtalk::question_hook(upper_limit, question, my_app, _, _, 3.7).

See also

ask_question/5, 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,