Struct trie_db::FatDBMut

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pub struct FatDBMut<'db, L>
where L: TrieLayout,
{ /* private fields */ }
Expand description

A mutable Trie implementation which hashes keys and uses a generic HashDB backing database. Additionaly it stores inserted hash-key mappings for later retrieval.

Use it as a Trie or TrieMut trait object.

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impl<'db, L> FatDBMut<'db, L>
where L: TrieLayout,

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pub fn new( db: &'db mut dyn HashDB<L::Hash, DBValue>, root: &'db mut TrieHash<L>, ) -> Self

Create a new trie with the backing database db and empty root Initialise to the state entailed by the genesis block. This guarantees the trie is built correctly.

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pub fn from_existing( db: &'db mut dyn HashDB<L::Hash, DBValue>, root: &'db mut TrieHash<L>, ) -> Self

Create a new trie with the backing database db and root.

Returns an error if root does not exist.

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pub fn db(&self) -> &dyn HashDB<L::Hash, DBValue>

Get the backing database.

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pub fn db_mut(&mut self) -> &mut dyn HashDB<L::Hash, DBValue>

Get the backing database.

Trait Implementations§

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impl<'db, L> TrieMut<L> for FatDBMut<'db, L>
where L: TrieLayout,

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fn root(&mut self) -> &TrieHash<L>

Return the root of the trie.
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fn is_empty(&self) -> bool

Is the trie empty?
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fn contains(&self, key: &[u8]) -> Result<bool, TrieHash<L>, CError<L>>

Does the trie contain a given key?
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fn get<'a, 'key>( &'a self, key: &'key [u8], ) -> Result<Option<DBValue>, TrieHash<L>, CError<L>>
where 'a: 'key,

What is the value of the given key in this trie?
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fn insert( &mut self, key: &[u8], value: &[u8], ) -> Result<Option<Value<L>>, TrieHash<L>, CError<L>>

Insert a key/value pair into the trie. An empty value is equivalent to removing key from the trie. Returns the old value associated with this key, if it existed.
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fn remove( &mut self, key: &[u8], ) -> Result<Option<Value<L>>, TrieHash<L>, CError<L>>

Remove a key from the trie. Equivalent to making it equal to the empty value. Returns the old value associated with this key, if it existed.

Auto Trait Implementations§

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impl<'db, L> !Freeze for FatDBMut<'db, L>

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impl<'db, L> !RefUnwindSafe for FatDBMut<'db, L>

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impl<'db, L> !Send for FatDBMut<'db, L>

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impl<'db, L> !Sync for FatDBMut<'db, L>

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impl<'db, L> Unpin for FatDBMut<'db, L>
where <<L as TrieLayout>::Hash as Hasher>::Out: Unpin,

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impl<'db, L> !UnwindSafe for FatDBMut<'db, L>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.