Trait sp_std::default::Default

pub trait Default {
    fn default() -> Self;
}

A trait for giving a type a useful default value.

Sometimes, you want to fall back to some kind of default value, and don’t particularly care what it is. This comes up often with structs that define a set of options:

struct SomeOptions {
    foo: i32,
    bar: f32,
}

How can we define some default values? You can use Default:

#[derive(Default)]
struct SomeOptions {
    foo: i32,
    bar: f32,
}

fn main() {
    let options: SomeOptions = Default::default();
}

Now, you get all of the default values. Rust implements Default for various primitives types.

If you want to override a particular option, but still retain the other defaults:

fn main() {
    let options = SomeOptions { foo: 42, ..Default::default() };
}

Derivable

This trait can be used with #[derive] if all of the type’s fields implement Default. When derived, it will use the default value for each field’s type.

How can I implement Default?

Provide an implementation for the default() method that returns the value of your type that should be the default:

enum Kind {
    A,
    B,
    C,
}

impl Default for Kind {
    fn default() -> Self { Kind::A }
}

Examples

#[derive(Default)]
struct SomeOptions {
    foo: i32,
    bar: f32,
}

Required methods

fn default() -> Self

Returns the “default value” for a type.

Default values are often some kind of initial value, identity value, or anything else that may make sense as a default.

Examples

Using built-in default values:

let i: i8 = Default::default();
let (x, y): (Option<String>, f64) = Default::default();
let (a, b, (c, d)): (i32, u32, (bool, bool)) = Default::default();

Making your own:

enum Kind {
    A,
    B,
    C,
}

impl Default for Kind {
    fn default() -> Self { Kind::A }
}

Implementations on Foreign Types

impl<T, S> Default for HashSet<T, S> where
    S: Default, 

pub fn default() -> HashSet<T, S>

Creates an empty HashSet<T, S> with the Default value for the hasher.

impl<K, V, S> Default for HashMap<K, V, S> where
    S: Default, 

pub fn default() -> HashMap<K, V, S>

Creates an empty HashMap<K, V, S>, with the Default value for the hasher.

impl<'_> Default for &'_ CStr

pub fn default() -> &'_ CStr

impl Default for CString

pub fn default() -> CString

Creates an empty CString.

impl Default for PathBuf

pub fn default() -> PathBuf

impl<T> Default for SyncOnceCell<T>

pub fn default() -> SyncOnceCell<T>

impl Default for OsString

pub fn default() -> OsString

Constructs an empty OsString.

impl<T> Default for Cursor<T> where
    T: Default, 

pub fn default() -> Cursor<T>

impl Default for DefaultHasher

pub fn default() -> DefaultHasher

Creates a new DefaultHasher using new. See its documentation for more.

impl Default for RandomState

pub fn default() -> RandomState

Constructs a new RandomState.

impl<'_> Default for &'_ OsStr

pub fn default() -> &'_ OsStr

Creates an empty OsStr.

impl<T> Default for SyncLazy<T, fn() -> T> where
    T: Default, 

pub fn default() -> SyncLazy<T, fn() -> T>

Creates a new lazy value using Default as the initializing function.

impl<T> Default for [T; 10] where
    T: Default, 

pub fn default() -> [T; 10]

impl<T> Default for [T; 20] where
    T: Default, 

pub fn default() -> [T; 20]

impl<T> Default for [T; 3] where
    T: Default, 

pub fn default() -> [T; 3]

impl Default for f64

pub fn default() -> f64

Returns the default value of 0.0

impl<A, B, C, D, E, F, G, H, I, J> Default for (A, B, C, D, E, F, G, H, I, J) where
    C: Default,
    A: Default,
    E: Default,
    F: Default,
    I: Default,
    B: Default,
    H: Default,
    D: Default,
    G: Default,
    J: Default, 

pub fn default() -> (A, B, C, D, E, F, G, H, I, J)

impl<T> Default for [T; 25] where
    T: Default, 

pub fn default() -> [T; 25]

impl<'_> Default for &'_ mut str

pub fn default() -> &'_ mut str

Creates an empty mutable str

impl<T> Default for [T; 8] where
    T: Default, 

pub fn default() -> [T; 8]

impl<T> Default for [T; 16] where
    T: Default, 

pub fn default() -> [T; 16]

impl Default for f32

pub fn default() -> f32

Returns the default value of 0.0

impl Default for i32

pub fn default() -> i32

Returns the default value of 0

impl<T> Default for [T; 9] where
    T: Default, 

pub fn default() -> [T; 9]

impl<T> Default for Option<T>

pub fn default() -> Option<T>

Returns None.

Examples

let opt: Option<u32> = Option::default();
assert!(opt.is_none());

impl<T> Default for [T; 29] where
    T: Default, 

pub fn default() -> [T; 29]

impl<T> Default for [T; 30] where
    T: Default, 

pub fn default() -> [T; 30]

impl Default for isize

pub fn default() -> isize

Returns the default value of 0

impl<A, B, C> Default for (A, B, C) where
    C: Default,
    A: Default,
    B: Default, 

pub fn default() -> (A, B, C)

impl<T> Default for Lazy<T, fn() -> T> where
    T: Default, 

pub fn default() -> Lazy<T, fn() -> T>

Creates a new lazy value using Default as the initializing function.

impl Default for char

pub fn default() -> char

Returns the default value of \x00

impl<T> Default for [T; 32] where
    T: Default, 

pub fn default() -> [T; 32]

impl<'_, T> Default for &'_ mut [T]

pub fn default() -> &'_ mut [T]

Creates a mutable empty slice.

impl<A, B, C, D, E, F, G> Default for (A, B, C, D, E, F, G) where
    C: Default,
    A: Default,
    E: Default,
    F: Default,
    B: Default,
    D: Default,
    G: Default, 

pub fn default() -> (A, B, C, D, E, F, G)

impl<T> Default for OnceCell<T>

pub fn default() -> OnceCell<T>

impl Default for u16

pub fn default() -> u16

Returns the default value of 0

impl Default for usize

pub fn default() -> usize

Returns the default value of 0

impl Default for u8

pub fn default() -> u8

Returns the default value of 0

impl<T> Default for [T; 5] where
    T: Default, 

pub fn default() -> [T; 5]

impl<A, B, C, D, E, F, G, H> Default for (A, B, C, D, E, F, G, H) where
    C: Default,
    A: Default,
    E: Default,
    F: Default,
    B: Default,
    H: Default,
    D: Default,
    G: Default, 

pub fn default() -> (A, B, C, D, E, F, G, H)

impl<A, B, C, D, E> Default for (A, B, C, D, E) where
    C: Default,
    A: Default,
    E: Default,
    B: Default,
    D: Default, 

pub fn default() -> (A, B, C, D, E)

impl Default for u32

pub fn default() -> u32

Returns the default value of 0

impl<A, B, C, D, E, F, G, H, I> Default for (A, B, C, D, E, F, G, H, I) where
    C: Default,
    A: Default,
    E: Default,
    F: Default,
    I: Default,
    B: Default,
    H: Default,
    D: Default,
    G: Default, 

pub fn default() -> (A, B, C, D, E, F, G, H, I)

impl Default for bool

pub fn default() -> bool

Returns the default value of false

impl<T> Default for [T; 24] where
    T: Default, 

pub fn default() -> [T; 24]

impl<A, B, C, D, E, F, G, H, I, J, K, L> Default for (A, B, C, D, E, F, G, H, I, J, K, L) where
    C: Default,
    A: Default,
    E: Default,
    K: Default,
    F: Default,
    I: Default,
    B: Default,
    H: Default,
    D: Default,
    G: Default,
    J: Default,
    L: Default, 

pub fn default() -> (A, B, C, D, E, F, G, H, I, J, K, L)

impl Default for u64

pub fn default() -> u64

Returns the default value of 0

impl<A, B, C, D> Default for (A, B, C, D) where
    C: Default,
    A: Default,
    B: Default,
    D: Default, 

pub fn default() -> (A, B, C, D)

impl<A, B> Default for (A, B) where
    A: Default,
    B: Default, 

pub fn default() -> (A, B)

impl Default for u128

pub fn default() -> u128

Returns the default value of 0

impl<T> Default for [T; 17] where
    T: Default, 

pub fn default() -> [T; 17]

impl Default for i8

pub fn default() -> i8

Returns the default value of 0

impl<T> Default for [T; 15] where
    T: Default, 

pub fn default() -> [T; 15]

impl<A, B, C, D, E, F, G, H, I, J, K> Default for (A, B, C, D, E, F, G, H, I, J, K) where
    C: Default,
    A: Default,
    E: Default,
    K: Default,
    F: Default,
    I: Default,
    B: Default,
    H: Default,
    D: Default,
    G: Default,
    J: Default, 

pub fn default() -> (A, B, C, D, E, F, G, H, I, J, K)

impl Default for i16

pub fn default() -> i16

Returns the default value of 0

impl<T> Default for [T; 18] where
    T: Default, 

pub fn default() -> [T; 18]

impl<T> Default for [T; 2] where
    T: Default, 

pub fn default() -> [T; 2]

impl<T> Default for [T; 4] where
    T: Default, 

pub fn default() -> [T; 4]

impl<T> Default for [T; 27] where
    T: Default, 

pub fn default() -> [T; 27]

impl Default for i128

pub fn default() -> i128

Returns the default value of 0

impl<T> Default for [T; 23] where
    T: Default, 

pub fn default() -> [T; 23]

impl<T> Default for [T; 22] where
    T: Default, 

pub fn default() -> [T; 22]

impl<T> Default for [T; 6] where
    T: Default, 

pub fn default() -> [T; 6]

impl<T> Default for [T; 13] where
    T: Default, 

pub fn default() -> [T; 13]

impl Default for ()

pub fn default()

Returns the default value of ()

impl<T> Default for [T; 19] where
    T: Default, 

pub fn default() -> [T; 19]

impl<T> Default for [T; 1] where
    T: Default, 

pub fn default() -> [T; 1]

impl<T> Default for [T; 26] where
    T: Default, 

pub fn default() -> [T; 26]

impl<T> Default for [T; 7] where
    T: Default, 

pub fn default() -> [T; 7]

impl<T> Default for [T; 31] where
    T: Default, 

pub fn default() -> [T; 31]

impl<'_> Default for &'_ str

pub fn default() -> &'_ str

Creates an empty str

impl<A> Default for (A,) where
    A: Default, 

pub fn default() -> (A,)

impl<T> Default for [T; 28] where
    T: Default, 

pub fn default() -> [T; 28]

impl<T> Default for [T; 0]

pub fn default() -> [T; 0]

impl<T> Default for [T; 14] where
    T: Default, 

pub fn default() -> [T; 14]

impl<A, B, C, D, E, F> Default for (A, B, C, D, E, F) where
    C: Default,
    A: Default,
    E: Default,
    F: Default,
    B: Default,
    D: Default, 

pub fn default() -> (A, B, C, D, E, F)

impl<T> Default for [T; 21] where
    T: Default, 

pub fn default() -> [T; 21]

impl<T> Default for [T; 12] where
    T: Default, 

pub fn default() -> [T; 12]

impl Default for i64

pub fn default() -> i64

Returns the default value of 0

impl<'_, T> Default for &'_ [T]

pub fn default() -> &'_ [T]

Creates an empty slice.

impl<T> Default for [T; 11] where
    T: Default, 

pub fn default() -> [T; 11]

impl<T> Default for BinaryHeap<T> where
    T: Ord, 

pub fn default() -> BinaryHeap<T>

Creates an empty BinaryHeap<T>.

impl<T> Default for LinkedList<T>

pub fn default() -> LinkedList<T>

Creates an empty LinkedList<T>.

impl Default for String

pub fn default() -> String

Creates an empty String.

Implementors

impl Default for Global

impl Default for System

impl Default for Box<str, Global>

impl Default for Box<CStr, Global>

impl Default for Box<OsStr, Global>

impl Default for Error

impl Default for SipHasher

impl Default for PhantomPinned

impl Default for RangeFull

impl Default for Writer

impl Default for AtomicBool

impl Default for AtomicI8

impl Default for AtomicI16

impl Default for AtomicI32

impl Default for AtomicI64

impl Default for AtomicIsize

impl Default for AtomicU8

impl Default for AtomicU16

impl Default for AtomicU32

impl Default for AtomicU64

impl Default for AtomicUsize

impl Default for Condvar

impl Default for Duration

impl<'_, B> Default for Cow<'_, B> where
    B: ToOwned + ?Sized,
    <B as ToOwned>::Owned: Default, 

impl<H> Default for BuildHasherDefault<H>

impl<Idx> Default for Range<Idx> where
    Idx: Default, 

impl<K, V> Default for BTreeMap<K, V> where
    K: Ord, 

impl<T> Default for Box<[T], Global>

impl<T> Default for Box<T, Global> where
    T: Default, 

impl<T> Default for Cell<T> where
    T: Default, 

impl<T> Default for RefCell<T> where
    T: Default, 

impl<T> Default for UnsafeCell<T> where
    T: Default, 

impl<T> Default for Reverse<T> where
    T: Default, 

impl<T> Default for BTreeSet<T> where
    T: Ord, 

impl<T> Default for VecDeque<T>

impl<T> Default for Empty<T>

impl<T> Default for PhantomData<T> where
    T: ?Sized, 

impl<T> Default for ManuallyDrop<T> where
    T: Default + ?Sized, 

impl<T> Default for Wrapping<T> where
    T: Default, 

impl<T> Default for Rc<T> where
    T: Default, 

impl<T> Default for sp_std::rc::Weak<T>

impl<T> Default for AtomicPtr<T>

impl<T> Default for Arc<T> where
    T: Default, 

impl<T> Default for Mutex<T> where
    T: Default + ?Sized, 

impl<T> Default for RwLock<T> where
    T: Default, 

impl<T> Default for sp_std::sync::Weak<T>

impl<T> Default for Vec<T, Global>

impl Default for AnalysisChoice

impl Default for BenchmarkResults

impl Default for BenchmarkConfig

impl Default for BenchmarkList

impl Default for BenchmarkMetadata

impl<K, V, S> Default for BoundedBTreeMap<K, V, S> where     K: Ord,     S: Get<u32>,

impl<T, S> Default for BoundedBTreeSet<T, S> where     T: Ord,     S: Get<u32>,

impl<T, S> Default for BoundedVec<T, S>

impl<T, S> Default for WeakBoundedVec<T, S>

impl<B: Balance, OnDrop: HandleImbalanceDrop<B>, OppositeOnDrop: HandleImbalanceDrop<B>> Default for Imbalance<B, OnDrop, OppositeOnDrop>

impl Default for CallMetadata

impl Default for StorageVersion

impl Default for Pays

impl Default for DispatchClass

impl Default for DispatchInfo

impl Default for PostDispatchInfo

impl Default for RuntimeDbWeight

impl<T: Default> Default for PerDispatchClass<T>

impl Default for GenesisConfig

impl Default for BlockLength

impl Default for ValidationErrors

impl Default for BlockWeights

impl<T: SigningTypes, C: AppCrypto<T::Public, T::Signature>, X> Default for Signer<T, C, X>

impl<T: Default + Config + Send + Sync> Default for CheckWeight<T>

impl Default for GenesisConfig

impl Default for Phase

impl<Index: Default, AccountData: Default> Default for AccountInfo<Index, AccountData>

impl Default for InitKind

impl<T> Default for ChainContext<T>

impl Default for Extensions

impl Default for DebugPrinter

impl Default for ProxyType

impl Default for SessionKeys

impl Default for NposSolution16

impl Default for GenesisConfig

impl Default for SessionKeys

impl Default for GenesisConfig

impl Default for GenesisParameters

impl<Balance: Default, DepositBalance: Default> Default for Approval<Balance, DepositBalance>

impl<Balance: Default, Extra: Default> Default for AssetBalance<Balance, Extra>

impl<DepositBalance: Default, BoundedString: Default> Default for AssetMetadata<DepositBalance, BoundedString>

impl<T: Config> Default for GenesisConfig<T>

impl Default for GenesisConfig

impl<I, R, L> Default for EquivocationHandler<I, R, L>

impl Default for GenesisConfig

impl<T: Config<I>, I: 'static> Default for GenesisConfig<T, I>

impl<Balance: Default> Default for AccountData<Balance>

impl<T: Config<I>, I: 'static> Default for PositiveImbalance<T, I>

impl<T: Config<I>, I: 'static> Default for NegativeImbalance<T, I>

impl<T: Config<I>, I: Instance> Default for GenesisConfig<T, I>

impl<T: Config> Default for Schedule<T>

impl Default for Limits

impl<T: Config> Default for InstructionWeights<T>

impl<T: Config> Default for HostFnWeights<T>

impl Default for Conviction

impl<Balance: Default> Default for Tally<Balance>

impl<Balance: Default> Default for Delegations<Balance>

impl Default for Vote

impl<Balance: Default, AccountId, BlockNumber: Zero> Default for Voting<Balance, AccountId, BlockNumber>

impl<T: Config> Default for GenesisConfig<T>

impl<AccountId: Default, Balance: Default + HasCompact, Solution: Default> Default for SignedSubmission<AccountId, Balance, Solution>

impl<Bn> Default for Phase<Bn>

impl Default for ElectionCompute

impl<C: Default> Default for RawSolution<C>

impl<A: Default> Default for ReadySolution<A>

impl<A: Default> Default for RoundSnapshot<A>

impl Default for SolutionOrSnapshotSize

impl<Balance: Default> Default for VoterInfo<Balance>

impl<T: Config> Default for GenesisConfig<T>

impl<AccountId: Default, Balance: Default> Default for Voter<AccountId, Balance>

impl<AccountId: Default, Balance: Default> Default for SeatHolder<AccountId, Balance>

impl<T: Config> Default for GenesisConfig<T>

impl<T: Config> Default for GenesisConfig<T>

impl Default for Public

impl Default for Signature

impl<Balance: Default, AccountId: Default> Default for GiltBid<Balance, AccountId>

impl<Balance: Default, AccountId: Default, BlockNumber: Default> Default for ActiveGilt<Balance, AccountId, BlockNumber>

impl<Balance: Default> Default for ActiveGiltsTotal<Balance>

impl Default for GenesisConfig

impl<I, R, L, O> Default for EquivocationHandler<I, R, L, O>

impl Default for GenesisConfig

impl Default for Data

impl Default for IdentityFields

impl<T: Config> Default for GenesisConfig<T>

impl<T: Config> Default for GenesisConfig<T>

impl<BlockNumber: Default, Balance: Default> Default for LotteryConfig<BlockNumber, Balance>

impl<T: Config<I>, I: Instance> Default for GenesisConfig<T, I>

impl<BlockNumber: Default> Default for Timepoint<BlockNumber>

impl<BlockNumber: Default, Balance: Default, AccountId: Default> Default for Multisig<BlockNumber, Balance, AccountId>

impl<T: Config> Default for GenesisConfig<T>

impl<BlockNumber: Default, Balance: Default, AccountId: Default> Default for ActiveRecovery<BlockNumber, Balance, AccountId>

impl<BlockNumber: Default, Balance: Default, AccountId: Default> Default for RecoveryConfig<BlockNumber, Balance, AccountId>

impl Default for GenesisConfig

impl<T: Config<I>, I: 'static> Default for GenesisConfig<T, I>

impl<T: Config> Default for GenesisConfig<T>

impl<Balance: Default, BlockNumber: Default> Default for Payout<Balance, BlockNumber>

impl<T: Config<I>, I: Instance> Default for GenesisConfig<T, I>

impl<T: Config> Default for GenesisConfig<T>

impl<AccountId: Default + Ord> Default for EraRewardPoints<AccountId>

impl<AccountId> Default for RewardDestination<AccountId>

impl Default for ValidatorPrefs

impl<AccountId: Default, Balance: Default + HasCompact> Default for Exposure<AccountId, Balance>

impl<AccountId: Default, Balance: Default + HasCompact> Default for UnappliedSlash<AccountId, Balance>

impl Default for Forcing

impl<T: Config> Default for GenesisConfig<T>

impl<Balance: Default> Default for RuntimeDispatchInfo<Balance>

impl Default for GenesisConfig

impl<T: Config> Default for GenesisConfig<T>

impl Default for GenesisConfig

impl<AccountId: Default, DepositBalance: Default> Default for InstanceDetails<AccountId, DepositBalance>

impl<DepositBalance: Default, StringLimit: Default + Get<u32>> Default for ClassMetadata<DepositBalance, StringLimit>

impl<DepositBalance: Default, StringLimit: Default + Get<u32>> Default for InstanceMetadata<DepositBalance, StringLimit>

impl<T: Config> Default for GenesisConfig<T>

impl<B: BlockT> Default for Mode<B>

impl<B: BlockT> Default for OnlineConfig<B>

impl Default for SnapshotConfig

impl<B: BlockT> Default for Builder<B>

impl Default for WorkerConfig

impl Default for RecordProof

impl<B: Ord, T: Group + Default> Default for Forks<B, T>

impl Default for ChainType

impl Default for MemorySize

impl Default for StateDbMemoryInfo

impl Default for MemoryInfo

impl Default for IoInfo

impl Default for UsageInfo

impl Default for ExecutionStrategies

impl<Block: Block> Default for ExecutionExtensions<Block>

impl<Block: BlockT> Default for Blockchain<Block>

impl<Header: Default + HeaderT> Default for RemoteHeaderRequest<Header> where     Header::Hash: Default,     Header::Number: Default,

impl<Header: Default + HeaderT> Default for RemoteBodyRequest<Header>

impl<Block: BlockT> Default for StorageNotifications<Block>

impl Default for ImportedAux

impl Default for CheckForEquivocation

impl Default for EpochAuthorship

impl<Hash, Number, E: Epoch> Default for EpochChanges<Hash, Number, E> where     Hash: PartialEq + Ord,     Number: Ord,

impl<Difficulty: Default> Default for PowIntermediate<Difficulty>

impl<Difficulty: Default> Default for PowAux<Difficulty>

impl<N: BaseArithmetic> Default for BackoffAuthoringOnFinalizedHeadLagging<N>

impl Default for WasmExecutionMethod

impl<Block, B> Default for VotingRulesBuilder<Block, B> where     Block: BlockT,     B: HeaderBackend<Block> + 'static,

impl Default for OutputFormat

impl Default for AlwaysBadChecker

impl Default for BitswapConfig

impl Default for SyncMode

impl Default for SetConfig

impl Default for NodeKeyConfig

impl Default for FullPeerConfig

impl Default for MetricsLink

impl Default for Metadata

impl Default for OffchainWorkerConfig

impl Default for RpcMethods

impl<Block: BlockT> Default for ClientConfig<Block>

impl<H: Default + Hash> Default for ChangeSet<H>

impl<H: Default + Hash> Default for CommitSet<H>

impl Default for Constraints

impl Default for PruningMode

impl Default for TracingReceiver

impl Default for Values

impl Default for Options

impl Default for Public

impl Default for Signature

impl Default for Public

impl Default for Signature

impl Default for Public

impl Default for Signature

impl Default for BigUint

impl Default for FixedI64

impl Default for FixedI128

impl Default for FixedU128

impl Default for Percent

impl Default for PerU16

impl Default for Permill

impl Default for Perbill

impl Default for Perquintill

impl Default for RationalInfinite

impl Default for Rational128

impl<Block: BlockT> Default for HeaderMetadataCache<Block>

impl Default for Slot

impl Default for Ss58AddressFormat

impl Default for AccountId32

impl Default for Dummy

impl Default for KeyTypeId

impl Default for CryptoTypeId

impl Default for CryptoTypePublicPair

impl Default for ChangesTrieConfiguration

impl Default for Public

impl Default for Signature

impl Default for Public

impl Default for Signature

impl Default for InMemOffchainStorage

impl Default for PendingRequest

impl Default for TestPersistentOffchainDB

impl Default for OffchainState

impl Default for TestOffchainExt

impl Default for PoolState

impl Default for TestTransactionPoolExt

impl Default for OpaqueNetworkState

impl Default for Timestamp

impl Default for Duration

impl Default for Public

impl Default for Signature

impl Default for TaskExecutor

impl Default for OpaquePeerId

impl Default for MemDb

impl<H: Default> Default for Transaction<H>

impl Default for Extensions

impl<'a> Default for VersionedAuthorityList<'a>

impl Default for InherentData

impl Default for CheckInherentsResult

impl<T> Default for Crossing<T> where     T: Default + Encode + Decode,

impl Default for KeyStore

impl<AccountId: Default, P: Default + PerThing> Default for Assignment<AccountId, P>

impl<AccountId: Default> Default for StakedAssignment<AccountId>

impl<VoterIndex: Default, TargetIndex: Default, P: Default + PerThing> Default for IndexAssignment<VoterIndex, TargetIndex, P>

impl<AccountId: Default> Default for Candidate<AccountId>

impl<AccountId: Default> Default for Edge<AccountId>

impl<AccountId: Default> Default for Voter<AccountId>

impl<AccountId: Default> Default for Support<AccountId>

impl Default for NumberOrHex

impl Default for Data

impl Default for TraceError

impl<Item> Default for Digest<Item>

impl<AccountId: Default, AccountIndex> Default for MultiAddress<AccountId, AccountIndex>

impl<T: Default> Default for Request<'static, T>

impl Default for Time

impl<B: BlockNumberProvider> Default for BlockAndTimeDeadline<B>

impl<B: BlockNumberProvider> Default for BlockAndTime<B>

impl Default for RuntimeString

impl Default for UintAuthorityId

impl<T: Default> Default for IdentityLookup<T>

impl Default for ValidTransaction

impl Default for ValidTransactionBuilder

impl Default for MultiSignature

impl Default for MultiSigner

impl Default for AnySignature

impl Default for OpaqueExtrinsic

impl Default for MembershipProof

impl Default for BasicExternalities

impl<H: Hasher> Default for TrieBackend<MemoryDB<H>, H> where     H::Out: Codec + Ord,

impl Default for OffchainOverlayedChanges

impl Default for OverlayedChanges

impl<Transaction, H: Hasher, N: BlockNumber> Default for StorageTransactionCache<Transaction, H, N>

impl<Transaction: Default, H: Hasher, N: BlockNumber> Default for StorageChanges<Transaction, H, N>

impl<Hash: Default> Default for ProofRecorder<Hash>

impl Default for UsageUnit

impl Default for StateMachineStats

impl<H: Hasher, N: ChangesTrieBlockNumber> Default for TestExternalities<H, N> where     H::Out: Ord + 'static + Codec,

impl Default for StorageData

impl Default for Storage

impl Default for Timestamp

impl Default for WasmLevel

impl Default for WasmMetadata

impl Default for WasmEntryAttributes

impl<H: Default> Default for NodeCodec<H>

impl Default for TrieStream

impl<H: Default> Default for Layout<H>

impl<T> Default for StatusSinks<T>

impl Default for RuntimeVersion

impl<Block: BlockT, Executor, G: GenesisInit> Default for TestClientBuilder<Block, Executor, Backend<Block>, G>

impl Default for GenesisConfig

impl Default for SessionKeys

impl Default for GenesisParameters

impl Default for LightFetcher

impl Default for ChainState