Enum frame_support::storage::child::StateVersion

pub enum StateVersion {
    V0,
    V1,
}

Different possible state version.

V0 and V1 uses a same trie implementation, but V1 will write external value node in the trie for value with size at least TRIE_VALUE_NODE_THRESHOLD.

Variants

V0

Old state version, no value nodes.

V1

New state version can use value nodes.

Implementations

impl StateVersion

pub fn state_value_threshold(&self) -> Option<u32>

If defined, values in state of size bigger or equal to this threshold will use a separate trie node. Otherwhise, value will be inlined in branch or leaf node.

Trait Implementations

impl Clone for StateVersion

fn clone(&self) -> StateVersion

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StateVersion

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

Formats the value using the given formatter.

impl Decode for StateVersion

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

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 Default for StateVersion

fn default() -> StateVersion

Returns the “default value” for a type.

impl Display for StateVersion

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

Formats the value using the given formatter.

impl Encode for StateVersion

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

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

fn size_hint(&self) -> usize

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

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

Convert self to an owned vector.

fn using_encoded<R, F>(&self, f: F) -> Rwhere 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 PartialEq<StateVersion> for StateVersion

fn eq(&self, other: &StateVersion) -> 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 PassBy for StateVersion

type PassBy = Enum<StateVersion>

The strategy that should be used to pass the type.

impl TryFrom<u8> for StateVersion

type Error = ()

The type returned in the event of a conversion error.

fn try_from(val: u8) -> Result<StateVersion, ()>

Performs the conversion.

impl Copy for StateVersion

impl EncodeLike<StateVersion> for StateVersion

impl Eq for StateVersion

impl StructuralEq for StateVersion

impl StructuralPartialEq for StateVersion