Enum frame_metadata::v14::StorageEntryModifier

pub enum StorageEntryModifier {
    Optional,
    Default,
}

A storage entry modifier indicates how a storage entry is returned when fetched and what the value will be if the key is not present. Specifically this refers to the “return type” when fetching a storage entry, and what the value will be if the key is not present.

Optional means you should expect an Option<T>, with None returned if the key is not present. Default means you should expect a T with the default value of default if the key is not present.

Variants

Optional

The storage entry returns an Option<T>, with None if the key is not present.

Default

The storage entry returns T::Default if the key is not present.

Trait Implementations

impl Clone for StorageEntryModifier

fn clone(&self) -> StorageEntryModifier

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StorageEntryModifier

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

Formats the value using the given formatter.

impl Decode for StorageEntryModifier

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 StorageEntryModifier

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, 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<StorageEntryModifier> for StorageEntryModifier

fn eq(&self, other: &StorageEntryModifier) -> 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 Serialize for StorageEntryModifier

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where
    __S: Serializer,

Serialize this value into the given Serde serializer.

impl EncodeLike<StorageEntryModifier> for StorageEntryModifier

impl Eq for StorageEntryModifier

impl StructuralEq for StorageEntryModifier

impl StructuralPartialEq for StorageEntryModifier