Enum sp_storage::ChildInfo

pub enum ChildInfo {
    ParentKeyId(ChildTrieParentKeyId),
}

Information related to a child state.

Variants

ParentKeyId(ChildTrieParentKeyId)

This is the one used by default.

Implementations

impl ChildInfo

pub fn new_default(storage_key: &[u8]) -> Self

Instantiates child information for a default child trie of kind ChildType::ParentKeyId, using an unprefixed parent storage key.

pub fn new_default_from_vec(storage_key: Vec<u8>) -> Self

Same as new_default but with Vec<u8> as input.

pub fn try_update(&mut self, other: &ChildInfo) -> bool

Try to update with another instance, return false if both instance are not compatible.

pub fn keyspace(&self) -> &[u8]

Returns byte sequence (keyspace) that can be use by underlying db to isolate keys. This is a unique id of the child trie. The collision resistance of this value depends on the type of child info use. For ChildInfo::Default it is and need to be.

pub fn storage_key(&self) -> &[u8]

Returns a reference to the location in the direct parent of this trie but without the common prefix for this kind of child trie.

pub fn prefixed_storage_key(&self) -> PrefixedStorageKey

Return a the full location in the direct parent of this trie.

pub fn into_prefixed_storage_key(self) -> PrefixedStorageKey

Returns a the full location in the direct parent of this trie.

pub fn child_type(&self) -> ChildType

Returns the type for this child info.

Trait Implementations

impl Clone for ChildInfo

fn clone(&self) -> ChildInfo

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ChildInfo

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

Formats the value using the given formatter.

impl Decode for ChildInfo

fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy ) -> Result<Self, Error>

Attempt to deserialise the value from input.

fn decode_into<I>( input: &mut I, dst: &mut MaybeUninit<Self> ) -> Result<DecodeFinished, Error>

where I: Input,

Attempt to deserialize the value from input into a pre-allocated piece of memory.

fn skip<I>(input: &mut I) -> Result<(), Error>

where I: Input,

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Encode for ChildInfo

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode_to<__CodecOutputEdqy: Output + ?Sized>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy )

Convert self to a slice and append it to the destination.

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

Convert self to an owned vector.

fn using_encoded<R, F>(&self, f: F) -> R

where F: FnOnce(&[u8]) -> R,

Convert self to a slice and then invoke the given closure with it.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl Hash for ChildInfo

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ChildInfo

fn cmp(&self, other: &ChildInfo) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for ChildInfo

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for ChildInfo

fn partial_cmp(&self, other: &ChildInfo) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl EncodeLike for ChildInfo

impl Eq for ChildInfo

impl StructuralPartialEq for ChildInfo