Struct StorageMapDelta 

pub struct StorageMapDelta(/* private fields */);

StorageMapDelta stores the differences between two states of account storage maps.

The differences are represented as leaf updates: a map of updated item key (Word) to value (Word). For cleared items the value is EMPTY_WORD.

The LexicographicWord wrapper is necessary to order the keys in the same way as the in-kernel account delta which uses a link map.

Implementations

impl StorageMapDelta

pub fn new(map: BTreeMap<LexicographicWord, Word>) -> Self

Creates a new storage map delta from the provided leaves.

pub fn num_entries(&self) -> usize

Returns the number of changed entries in this map delta.

pub fn entries(&self) -> &BTreeMap<LexicographicWord, Word>

Returns a reference to the updated entries in this storage map delta.

Note that the returned key is the raw map key.

pub fn insert(&mut self, raw_key: Word, value: Word)

Inserts an item into the storage map delta.

pub fn is_empty(&self) -> bool

Returns true if storage map delta contains no updates.

pub fn merge(&mut self, other: Self)

Merge other into this delta, giving precedence to other.

pub fn as_map_mut(&mut self) -> &mut BTreeMap<LexicographicWord, Word>

Returns a mutable reference to the underlying map.

Trait Implementations

impl Clone for StorageMapDelta

fn clone(&self) -> StorageMapDelta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StorageMapDelta

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

Formats the value using the given formatter.

impl Default for StorageMapDelta

fn default() -> StorageMapDelta

Returns the “default value” for a type.

impl Deserializable for StorageMapDelta

fn read_from<R: ByteReader>( source: &mut R, ) -> Result<Self, DeserializationError>

Reads a sequence of bytes from the provided source, attempts to deserialize these bytes into Self, and returns the result.

fn read_from_bytes(bytes: &[u8]) -> Result<Self, DeserializationError>

Attempts to deserialize the provided bytes into Self and returns the result.

impl From<StorageMap> for StorageMapDelta

Converts a StorageMap into a StorageMapDelta for initial delta construction.

fn from(map: StorageMap) -> Self

Converts to this type from the input type.

impl PartialEq for StorageMapDelta

fn eq(&self, other: &StorageMapDelta) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serializable for StorageMapDelta

fn write_into<W: ByteWriter>(&self, target: &mut W)

Serializes self into bytes and writes these bytes into the target.

fn get_size_hint(&self) -> usize

Returns an estimate of how many bytes are needed to represent self.

fn to_bytes(&self) -> Vec<u8>

Serializes self into a vector of bytes.

impl Eq for StorageMapDelta

impl StructuralPartialEq for StorageMapDelta