Trait StorageList

pub trait StorageList<V: FullCodec> {
    type Iterator: Iterator<Item = V>;
    type Appender: StorageAppender<V>;

    // Required methods
    fn iter() -> Self::Iterator;
    fn drain() -> Self::Iterator;
    fn appender() -> Self::Appender;

    // Provided methods
    fn append_one<EncodeLikeValue>(item: EncodeLikeValue)
       where EncodeLikeValue: EncodeLike<V> { ... }
    fn append_many<EncodeLikeValue, I>(items: I)
       where EncodeLikeValue: EncodeLike<V>,
             I: IntoIterator<Item = EncodeLikeValue> { ... }
}

A non-continuous container type.

Required Associated Types

type Iterator: Iterator<Item = V>

Iterator for normal and draining iteration.

type Appender: StorageAppender<V>

Append iterator for fast append operations.

Required Methods

fn iter() -> Self::Iterator

List the elements in append order.

fn drain() -> Self::Iterator

Drain the elements in append order.

Note that this drains a value as soon as it is being inspected. For example take_while(|_| false) still drains the first element. This also applies to peek().

fn appender() -> Self::Appender

A fast append iterator.

Provided Methods

fn append_one<EncodeLikeValue>(item: EncodeLikeValue)

where EncodeLikeValue: EncodeLike<V>,

Append a single element.

Should not be called repeatedly; use append_many instead. Worst case linear O(len) with len being the number if elements in the list.

fn append_many<EncodeLikeValue, I>(items: I)

where EncodeLikeValue: EncodeLike<V>, I: IntoIterator<Item = EncodeLikeValue>,

Append many elements.

Should not be called repeatedly; use appender instead. Worst case linear O(len + items.count()) with len beings the number if elements in the list.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<Prefix, Value, ValuesPerNewPage> StorageList<Value> for StoragePagedList<Prefix, Value, ValuesPerNewPage>

where Prefix: StorageInstance, Value: FullCodec, ValuesPerNewPage: Get<u32>,

impl<T: Config<I>, I: 'static> StorageList<<T as Config<I>>::Value> for Pallet<T, I>