Module frame_support::traits

Traits for FRAME.

NOTE: If you're looking for parameter_types, it has moved in to the top-level module.

Modules

schedule

Structs

CallMetadata	The function and pallet name of the Call.
ClearFilterGuard	Guard type for clearing all pushed constraints from a FilterStack and reinstating them when dropped.
FilterStackGuard	Guard type for pushing a constraint to a FilterStack and popping when dropped.
SplitTwoWays	Split an unbalanced amount two ways between a common divisor.
StorageMapShim	A shim for placing around a storage item in order to use it as a StoredValue. Ideally this wouldn't be needed as StorageValues should blanket implement StoredValues, however this would break the ability to have custom impls of StoredValue. The other workaround is to implement it directly in the macro.
WithdrawReasons	Reasons for moving funds out of an account.

Enums

BalanceStatus	Status of funds.
ExistenceRequirement	Simple boolean for whether an account needs to be kept in existence.
SignedImbalance	Either a positive or a negative imbalance.
WithdrawReason	Reason for moving funds out of an account.

Traits

ChangeMembers	Trait for type that can handle incremental changes to a set of account IDs.
Contains	A trait for querying whether a type can be said to "contain" a value.
ContainsLengthBound	A trait for querying bound for the length of an implementation of Contains
Currency	Abstraction over a fungible assets system.
EnsureOrigin	Some sort of check on the origin is performed by this object.
EstimateNextNewSession	Something that can estimate at which block the next new_session will be triggered. This must always be implemented by the session module.
EstimateNextSessionRotation	Something that can estimate at which block the next session rotation will happen. This should be the same logical unit that dictates ShouldEndSession to the session module. No Assumptions are made about the scheduling of the sessions.
Filter	Simple trait for providing a filter over a reference to some type.
FilterStack	Trait to add a constraint onto the filter.
FindAuthor	A trait for finding the author of a block header based on the PreRuntime digests contained within it.
Get	A trait for querying a single fixed value from a type.
GetCallMetadata	Gets the metadata for the Call - function name and pallet name.
GetCallName	Gets the function name of the Call.
Happened	A simple, generic one-parameter event notifier/handler.
Imbalance	A trait for a not-quite Linear Type that tracks an imbalance.
InitializeMembers	Trait for type that can handle the initialization of account IDs at genesis.
InstanceFilter	Simple trait for providing a filter over a reference to some type, given an instance of itself.
IsDeadAccount	Determiner to say whether a given account is unused.
KeyOwnerProofSystem	Something which can compute and check proofs of a historical key owner and return full identification data of that key owner.
Lateness	Trait to be used by block producing consensus engine modules to determine how late the current block is (e.g. in a slot-based proposal mechanism how many slots were skipped since the previous block).
Len	Anything that can have a ::len() method.
LockableCurrency	A currency whose accounts can have liquidity restrictions.
ModuleToIndex	Something that can convert a given module into the index of the module in the runtime.
OffchainWorker	Off-chain computation trait.
OnFinalize	The block finalization trait. Implementing this lets you express what should happen for your module when the block is ending.
OnInitialize	The block initialization trait. Implementing this lets you express what should happen for your module when the block is beginning (right before the first extrinsic is executed).
OnKilledAccount	The account with the given id was reaped.
OnNewAccount	Handler for when a new account has been created.
OnRuntimeUpgrade	The runtime upgrade trait. Implementing this lets you express what should happen when the runtime upgrades, and changes may need to occur to your module.
OnUnbalanced	Handler for when some currency "account" decreased in balance for some reason.
Randomness
ReservableCurrency	A currency where funds can be reserved from the user.
StoredMap	An abstraction of a value stored within storage, but possibly as part of a larger composite item.
Time
TryDrop	A type for which some values make sense to be able to drop without further consideration.
UnixTime	Trait to deal with unix time.
ValidatorRegistration	Implementors of this trait provide information about whether or not some validator has been registered with them. The Session module is an implementor.
VerifySeal	A trait for verifying the seal of a header and returning the author.
VestingSchedule	A vesting schedule over a currency. This allows a particular currency to have vesting limits applied to it.

Type Definitions

LockIdentifier

An identifier for a lock. Used for disambiguating different locks so that they can be individually replaced or removed.