pub enum DigestItemRef<'a, Hash: 'a> {
    ChangesTrieRoot(&'a Hash),
    PreRuntime(&'a ConsensusEngineId, &'a Vec<u8>),
    Consensus(&'a ConsensusEngineId, &'a Vec<u8>),
    Seal(&'a ConsensusEngineId, &'a Vec<u8>),
    ChangesTrieSignal(&'a ChangesTrieSignal),
    Other(&'a Vec<u8>),
}
Expand description

A ‘referencing view’ for digest item. Does not own its contents. Used by final runtime implementations for encoding/decoding its log items.

Variants

ChangesTrieRoot(&'a Hash)

Reference to DigestItem::ChangesTrieRoot.

PreRuntime(&'a ConsensusEngineId, &'a Vec<u8>)

A pre-runtime digest.

These are messages from the consensus engine to the runtime, although the consensus engine can (and should) read them itself to avoid code and state duplication. It is erroneous for a runtime to produce these, but this is not (yet) checked.

Consensus(&'a ConsensusEngineId, &'a Vec<u8>)

A message from the runtime to the consensus engine. This should never be generated by the native code of any consensus engine, but this is not checked (yet).

Seal(&'a ConsensusEngineId, &'a Vec<u8>)

Put a Seal on it. This is only used by native code, and is never seen by runtimes.

ChangesTrieSignal(&'a ChangesTrieSignal)

Digest item that contains signal from changes tries manager to the native code.

Other(&'a Vec<u8>)

Any ‘non-system’ digest item, opaque to the native code.

Implementations

Cast this digest item into ChangesTrieRoot.

Cast this digest item into PreRuntime

Cast this digest item into Consensus

Cast this digest item into Seal

Cast this digest item into ChangesTrieSignal.

Cast this digest item into PreRuntime

Try to match this digest item to the given opaque item identifier; if it matches, then return the opaque data it contains.

Try to match this digest item to the given opaque item identifier; if it matches, then try to cast to the given data type; if that works, return it.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Convert self to an owned vector.

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

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

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

Calculates the encoded size. Read more

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

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Convert from a value of T into an equivalent instance of Option<Self>. Read more

Consume self to return Some equivalent value of Option<T>. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

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

Get a reference to the inner from the outer.

Get a mutable reference to the inner from the outer.

Should always be Self

Convert from a value of T into an equivalent instance of Self. Read more

Consume self to return an equivalent value of T. Read more

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The counterpart to unchecked_from.

Consume self to return an equivalent value of T.