Struct elrond_wasm::Queue

pub struct Queue<T> { /* fields omitted */ }

A simple queue struct that is able to push and pop without moving elements. New items are pushed at the end, just like for a regular Vec. When popping, instead of performing a regular Vec remove that would shift items, a start index is moved up 1 position. When serializing, items before the start index are ignored.

Implementations

impl<T> Queue<T>

pub fn new() -> Self

impl<T> Queue<T>

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn as_slice(&self) -> &[T]

pub fn push(&mut self, value: T)

pub fn peek(&self) -> Option<&T>

Returns a referenece to the first item in the queue, without removing it. Returns None if the queue is empty.

pub fn peek_mut(&mut self) -> Option<&mut T>

Returns a mutable referenece to the first item in the queue, without removing it. Returns None if the queue is empty.

pub fn pop(&mut self) -> Option<&T>

Removes the first element from the queue and returns a reference to it. Does not physically extract the element from the underlying structure. Does nothing and returns None if the queue is empty.

Trait Implementations

impl<T: Decode> Decode for Queue<T>

Deserializes like a Vec.

fn top_decode<I: Input>(input: &mut I) -> Result<Self, DecodeError>

Attempt to deserialise the value from input.

fn dep_decode<I: Input>(input: &mut I) -> Result<Self, DecodeError>

Attempt to deserialise the value from input, using the format of an object nested inside another structure. In case of success returns the deserialized value and the number of bytes consumed during the operation.

fn top_decode_from_i64<I>(_input: I) -> Option<Result<Self, DecodeError>> where
    I: FnOnce() -> i64, 

Used to optimize handling of arguments/storage. Optionally calls a closure that retrieves an i64 and if it returns Some(...), the result will be used.

impl<T> Default for Queue<T>

fn default() -> Self

Returns the "default value" for a type.

impl<T: Encode> Encode for Queue<T>

Serializes identically to a Vec, entries before start index are ignored.

fn dep_encode_to<O: Output>(&self, dest: &mut O) -> Result<(), EncodeError>

Encode to output, using the format of an object nested inside another structure. Does not provide compact version.

fn using_top_encoded<F: FnOnce(&[u8])>(&self, f: F) -> Result<(), EncodeError>

Convert self to a slice and then invoke the given closure with it. Allowed to provide compact version. Do not call for nested objects.

fn top_encode(&self) -> Result<Vec<u8>, EncodeError>

Convert self to an owned vector. Allowed to provide compact version. Do not call for nested objects.

fn top_encode_as_i64(&self) -> Option<Result<i64, EncodeError>>