Struct Absent 

pub struct Absent<T>(/* private fields */);

A list variable that was never given a value.

Empty would do, but a list has to name its item type or nothing can infer it, so this is Empty with the item type written down. Generated code uses it; you should never need to name it.

Absent is not the same as empty, and {{ rows.length }} is the one place the difference shows: a list that was never set counts as nothing, where a list with no items in it counts 0. That is what handlebars.js does with an undefined value against an empty array.

Implementations

impl<T> Absent<T>

pub fn new() -> Self

Creates the absent list.

Trait Implementations

impl<T> AsRef<[T]> for Absent<T>

fn as_ref(&self) -> &[T]

Converts this type into a shared reference of the (usually inferred) input type.

impl<T> Default for Absent<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T> Length for Absent<T>

type Count = Empty

What the count renders as: a number, or nothing at all when the list was never set.

fn length(&self) -> Empty

How many items this holds.

impl<T> Truthy for Absent<T>

A list that was never set is absent, and so is falsy — as an empty list is.

fn is_truthy(&self) -> bool

Whether {{#if}} should render its block for this value.