Struct StorageMapPatchEntries 

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

The changed entries of a storage map, represented as a map of changed item key (StorageMapKey) to value (Word). For cleared items the value is Word::empty.

Implementations

impl StorageMapPatchEntries

pub fn new() -> Self

Creates a new, empty set of map patch entries.

pub fn from_raw(entries: BTreeMap<StorageMapKey, Word>) -> Self

Creates a new set of map patch entries from the provided map.

pub fn num_entries(&self) -> usize

Returns the number of changed entries.

pub fn as_map(&self) -> &BTreeMap<StorageMapKey, Word>

Returns a reference to the changed entries.

Note that the returned key is the StorageMapKey.

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

Inserts an entry.

pub fn is_empty(&self) -> bool

Returns true if there are no changed entries.

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

Returns a mutable reference to the underlying map.

pub fn into_map(self) -> BTreeMap<StorageMapKey, Word>

Consumes self and returns the underlying map.

Trait Implementations

impl Clone for StorageMapPatchEntries

fn clone(&self) -> StorageMapPatchEntries

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StorageMapPatchEntries

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

Formats the value using the given formatter.

impl Default for StorageMapPatchEntries

fn default() -> StorageMapPatchEntries

Returns the “default value” for a type.

impl Deserializable for StorageMapPatchEntries

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 min_serialized_size() -> usize

Returns the minimum serialized size for one instance of this type.

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

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

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

Deserializes Self from bytes with a byte budget limit.

impl Eq for StorageMapPatchEntries

impl From<StorageMap> for StorageMapPatchEntries

Converts a StorageMap into a set of map patch entries for full state patch construction.

fn from(map: StorageMap) -> Self

Converts to this type from the input type.

impl FromIterator<(StorageMapKey, Word)> for StorageMapPatchEntries

fn from_iter<T: IntoIterator<Item = (StorageMapKey, Word)>>(iter: T) -> Self

Creates a new set of map patch entries from the provided iterators of cleared and updated entries.

impl PartialEq for StorageMapPatchEntries

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

Equality operator ==.

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

Inequality operator !=.

impl Serializable for StorageMapPatchEntries

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

Serializes the cleared and updated entries separately. Because the value of a cleared entry is always Word::empty, only its key is written, saving Word::SERIALIZED_SIZE bytes per cleared entry compared to writing the empty value.

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 StructuralPartialEq for StorageMapPatchEntries