Enum frame_support::storage::child::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]) -> ChildInfo

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>) -> ChildInfo

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<(), Error>

Formats the value using the given formatter.

impl Eq for ChildInfo

impl Hash for ChildInfo

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

Feeds this value into the given Hasher.

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

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.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl PartialEq<ChildInfo> 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: &ChildInfo) -> bool

This method tests for !=.

impl PartialOrd<ChildInfo> 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: &ChildInfo) -> bool

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

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

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

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

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

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

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