Module frame_support::storage::child

Operation on runtime child storages.

This module is a currently only a variant of unhashed with additional storage_key. Note that storage_key must be unique and strong (strong in the sense of being long enough to avoid collision from a resistant hash function (which unique implies)).

A key collision free unique id is required as parameter to avoid key collision between child tries. This unique id management and generation responsability is delegated to pallet module.

Enums

ChildInfo

Information related to a child state.

Functions

child_root	Calculate current child root value.
exists	Check to see if key has an explicit entry in storage.
get	Return the value of the item in storage under key, or None if there is no explicit entry.
get_or	Return the value of the item in storage under key, or default_value if there is no explicit entry.
get_or_default	Return the value of the item in storage under key, or the type's default if there is no explicit entry.
get_or_else	Return the value of the item in storage under key, or default_value() if there is no explicit entry.
get_raw	Get a Vec of bytes from storage.
kill	Ensure key has no explicit entry in storage.
kill_storage	Remove all storage_key key/values
put	Put value in storage under key.
put_raw	Put a raw byte slice into storage.
take	Remove key from storage, returning its value if it had an explicit entry or None otherwise.
take_or	Return the value of the item in storage under key, or default_value if there is no explicit entry. Ensure there is no explicit entry on return.
take_or_default	Remove key from storage, returning its value, or, if there was no explicit entry in storage, the default for its type.
take_or_else	Return the value of the item in storage under key, or default_value() if there is no explicit entry. Ensure there is no explicit entry on return.