[][src]Module frame_support::storage

Stuff to do with the runtime's storage.

Modules

child

Operation on runtime child storages.

hashed

Operation on runtime storage using hashed keys.

migration

Some utilities for helping access storage with arbitrary key types.

types

Storage types to build abstraction on storage, they implements storage traits such as StorageMap and others.

unhashed

Operation on unhashed runtime storage.

Structs

PrefixIterator

Iterate over a prefix and decode raw_key and raw_value into T.

Enums

TransactionOutcome

Describes on what should happen with a storage transaction.

Traits

IterableStorageDoubleMap

A strongly-typed double map in storage whose secondary keys and values can be iterated over.

IterableStorageMap

A strongly-typed map in storage whose keys and values can be iterated over.

StorageAppend

Marker trait that will be implemented for types that support the storage::append api.

StorageDecodeLength

Marker trait that will be implemented for types that support to decode their length in an effificent way. It is expected that the length is at the beginning of the encoded object and that the length is a Compact<u32>.

StorageDoubleMap

An implementation of a map with a two keys.

StorageMap

A strongly-typed map in storage.

StoragePrefixedMap

Trait for maps that store all its value after a unique prefix.

StorageValue

A trait for working with macro-generated storage values under the substrate storage API.

Functions

require_transaction

Assert this method is called within a storage transaction. This will panic if is not called within a storage transaction.

with_transaction

Execute the supplied function in a new storage transaction.