Struct ValueChoice 

pub struct ValueChoice<T> { /* private fields */ }

A Choice question over values known only at runtime, such as line or record ids.

Each value is sent as its Display text and parsed back with FromStr, so the two must round-trip. Options carry no descriptions; put what they refer to in the state.

use typesafe_client::{Questions, ValueChoice};

let lines = ["Refunds take 5 days.", "Contact support by email.", "Cancel anytime."];
let document: String = lines
    .iter()
    .enumerate()
    .map(|(i, line)| format!("{i}| {line}\n"))
    .collect();

let mut questions = Questions::new();
let line = questions.add(
    "line",
    ValueChoice::new("Which line says how long refunds take?", 0..lines.len()),
);
// `response.answer(&line)?` returns a `TypedChoice<usize>`.

Implementations

impl<T: Display> ValueChoice<T>

pub fn new<I>(instructions: impl Into<Content>, values: I) -> Self

where I: IntoIterator<Item = T>,

A Choice over values, asking instructions.

Trait Implementations

impl<T: Clone> Clone for ValueChoice<T>

fn clone(&self) -> ValueChoice<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for ValueChoice<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> IntoQuestion for ValueChoice<T>

where T: FromStr + Clone + PartialEq,

type Answer = ValueChoice<T>

How the answer is read; the type parameter of the returned QuestionKey.

fn into_question(self) -> Question

The question as sent on the wire.

impl<T: PartialEq> PartialEq for ValueChoice<T>

fn eq(&self, other: &ValueChoice<T>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<T> ReadAnswer for ValueChoice<T>

where T: FromStr + Clone + PartialEq,

type Output<'a> = TypedChoice<T>

What SystemOneResponse::answer returns for this key.

fn read(id: &str, answer: &Answer) -> Result<TypedChoice<T>, AnswerError>

Reads the answer to question id, failing when it has the wrong kind or content.

impl<T: PartialEq> StructuralPartialEq for ValueChoice<T>