Trait orkhon::prelude::ops::nn::tract_downcast_rs::__std::prelude::v1::Default

pub trait Default {
    pub 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

pub 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 }
}

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Implementations on Foreign Types

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

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

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

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

impl Default for u64

pub fn default() -> u64

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; 0]

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

impl Default for isize

pub fn default() -> isize

Returns the default value of 0

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

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

impl Default for i32

pub fn default() -> i32

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 [T; 19] where
    T: Default, 

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

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

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

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

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

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 u128

pub fn default() -> u128

Returns the default value of 0

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

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

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

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

impl Default for bool

pub fn default() -> bool

Returns the default value of false

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

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

impl Default for i16

pub fn default() -> i16

Returns the default value of 0

impl Default for ()

pub fn default()

Returns the default value of ()

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

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

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

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

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

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

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

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

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

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

impl Default for i64

pub fn default() -> i64

Returns the default value of 0

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

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

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

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

impl Default for u32

pub fn default() -> u32

Returns the default value of 0

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

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

impl Default for i8

pub fn default() -> i8

Returns the default value of 0

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

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

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<'_> Default for &'_ mut str

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

Creates an empty mutable str

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

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

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

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

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<'_> Default for &'_ str

pub fn default() -> &'_ str

Creates an empty str

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

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

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

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

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,
    I: Default,
    A: Default,
    E: Default,
    G: Default,
    F: Default,
    B: Default,
    J: Default,
    D: Default,
    H: Default, 

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

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

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

impl Default for i128

pub fn default() -> i128

Returns the default value of 0

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,
    I: Default,
    K: Default,
    A: Default,
    E: Default,
    G: Default,
    F: Default,
    B: Default,
    J: Default,
    D: Default,
    L: Default,
    H: Default, 

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

impl Default for u16

pub fn default() -> u16

Returns the default value of 0

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

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

impl Default for u8

pub fn default() -> u8

Returns the default value of 0

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

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

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

pub fn default() -> (A,)

impl Default for usize

pub fn default() -> usize

Returns the default value of 0

impl Default for f32

pub fn default() -> f32

Returns the default value of 0.0

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

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

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

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

Creates a mutable empty slice.

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

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

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

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

Creates an empty slice.

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

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

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

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

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

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

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

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

impl Default for char

pub fn default() -> char

Returns the default value of \x00

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

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

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

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

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

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

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

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

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,
    G: Default,
    F: Default,
    B: Default,
    D: Default,
    H: Default, 

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

impl<B> Default for BitSet<B> where
    B: BitBlock, 

pub fn default() -> BitSet<B>

impl<B> Default for BitVec<B> where
    B: BitBlock, 

pub fn default() -> BitVec<B>

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

pub fn default() -> Complex<T>

impl Default for bf16

pub fn default() -> bf16

impl Default for f16

pub fn default() -> f16

impl<K, V, S> Default for LOTable<K, V, S> where
    K: 'static + PartialEq<K> + Eq + Hash + Clone + Send + Sync,
    V: 'static + Clone + Send + Sync,
    S: Default + BuildHasher, 

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

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

impl Default for CountingBitonic

pub fn default() -> CountingBitonic

impl Default for TransactionState

pub fn default() -> TransactionState

impl Default for Txn

pub fn default() -> Txn

impl Default for Zone

pub fn default() -> Zone

impl<'g, T> Default for Shared<'g, T>

pub fn default() -> Shared<'g, T>

impl<T> Default for Atomic<T>

pub fn default() -> Atomic<T>

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

pub fn default() -> ShardedLock<T>

impl Default for Backoff

pub fn default() -> Backoff

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

pub fn default() -> AtomicCell<T>

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

pub fn default() -> CachePadded<T>

impl Default for Condvar

pub fn default() -> Condvar

impl Default for Once

pub fn default() -> Once

impl<R, T> Default for RwLock<R, T> where
    T: Default + ?Sized,
    R: RawRwLock, 

pub fn default() -> RwLock<R, T>

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

pub fn default() -> Mutex<R, T>

impl<R, G, T> Default for ReentrantMutex<R, G, T> where
    T: Default + ?Sized,
    R: RawMutex,
    G: GetThreadId, 

pub fn default() -> ReentrantMutex<R, G, T>

impl Default for UnparkResult

pub fn default() -> UnparkResult

impl Default for SpinWait

pub fn default() -> SpinWait

impl Default for Builder

pub fn default() -> Builder

impl Default for WriteStyle

pub fn default() -> WriteStyle

impl Default for Target

pub fn default() -> Target

impl Default for Builder

pub fn default() -> Builder

impl<'a> Default for Env<'a>

pub fn default() -> Env<'a>

impl Default for ColorSpec

pub fn default() -> ColorSpec

impl Default for Config

pub fn default() -> Config

impl Default for AhoCorasickBuilder

pub fn default() -> AhoCorasickBuilder

impl Default for MatchKind

The default match kind is MatchKind::Standard.

pub fn default() -> MatchKind

impl Default for MatchKind

pub fn default() -> MatchKind

impl Default for Builder

pub fn default() -> Builder

impl Default for ClassBytesRange

pub fn default() -> ClassBytesRange

impl Default for ParserBuilder

pub fn default() -> ParserBuilder

impl Default for TranslatorBuilder

pub fn default() -> TranslatorBuilder

impl Default for ClassUnicodeRange

pub fn default() -> ClassUnicodeRange

impl Default for ParserBuilder

pub fn default() -> ParserBuilder

impl<T> Default for ThreadLocal<T> where
    T: Send, 

pub fn default() -> ThreadLocal<T>

impl<T> Default for CachedThreadLocal<T> where
    T: Send, 

pub fn default() -> CachedThreadLocal<T>

impl<T> Default for OnceCell<T>

pub fn default() -> OnceCell<T>

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<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<T> Default for OnceCell<T>

pub fn default() -> OnceCell<T>

impl<T> Default for Slab<T>

pub fn default() -> Slab<T>

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Implementors

impl Default for TDim

pub fn default() -> TDim

impl Default for PadMode

pub fn default() -> PadMode

impl Default for KernelFormat

pub fn default() -> KernelFormat

impl Default for PaddingSpec

pub fn default() -> PaddingSpec

impl Default for DataFormat

pub fn default() -> DataFormat

impl Default for OrkhonConfig

fn default() -> OrkhonConfig

impl Default for Orkhon

fn default() -> Self

impl Default for AxisChangeConsequence

pub fn default() -> AxisChangeConsequence

impl Default for AxisInfo

pub fn default() -> AxisInfo

impl Default for Blob

pub fn default() -> Blob

impl Default for Invariants

pub fn default() -> Invariants

impl Default for SessionState

pub fn default() -> SessionState

impl Default for SymbolValues

pub fn default() -> SymbolValues

impl Default for Tensor

pub fn default() -> Tensor

impl Default for orkhon::prelude::internal::f16

pub fn default() -> f16

impl Default for FiniteReshape

pub fn default() -> FiniteReshape

impl Default for MultiBroadcastTo

pub fn default() -> MultiBroadcastTo

impl Default for Pad

pub fn default() -> Pad

impl Default for Slice

pub fn default() -> Slice

impl Default for Tile

pub fn default() -> Tile

impl Default for MaxPool

pub fn default() -> MaxPool

impl Default for PoolSpec

pub fn default() -> PoolSpec

impl Default for SumPool

pub fn default() -> SumPool

impl Default for Identity

pub fn default() -> Identity

impl Default for Iff

pub fn default() -> Iff

impl Default for MatMul

pub fn default() -> MatMul

impl Default for Error

pub fn default() -> Error

impl Default for Global

pub fn default() -> Global

impl Default for System

pub fn default() -> System

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 CString

pub fn default() -> CString

Creates an empty CString.

impl Default for OsString

pub fn default() -> OsString

Constructs an empty OsString.

impl Default for SipHasher

pub fn default() -> SipHasher

impl Default for PhantomPinned

pub fn default() -> PhantomPinned

impl Default for RangeFull

pub fn default() -> RangeFull

impl Default for PathBuf

pub fn default() -> PathBuf

impl Default for Box<str, Global>

pub fn default() -> Box<str, Global>

impl Default for Box<CStr, Global>

pub fn default() -> Box<CStr, Global>

impl Default for Box<OsStr, Global>

pub fn default() -> Box<OsStr, Global>

impl Default for String

pub fn default() -> String

Creates an empty String.

impl Default for AtomicBool

pub fn default() -> AtomicBool

Creates an AtomicBool initialized to false.

impl Default for AtomicI8

pub fn default() -> AtomicI8

impl Default for AtomicI16

pub fn default() -> AtomicI16

impl Default for AtomicI32

pub fn default() -> AtomicI32

impl Default for AtomicI64

pub fn default() -> AtomicI64

impl Default for AtomicIsize

pub fn default() -> AtomicIsize

impl Default for AtomicU8

pub fn default() -> AtomicU8

impl Default for AtomicU16

pub fn default() -> AtomicU16

impl Default for AtomicU32

pub fn default() -> AtomicU32

impl Default for AtomicU64

pub fn default() -> AtomicU64

impl Default for AtomicUsize

pub fn default() -> AtomicUsize

impl Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::sync::Condvar

pub fn default() -> Condvar

Creates a Condvar which is ready to be waited on and notified.

impl Default for Duration

pub fn default() -> Duration

impl Default for IxDynImpl

pub fn default() -> IxDynImpl

impl Default for Scan

pub fn default() -> Scan

impl Default for Downsample

pub fn default() -> Downsample

impl Default for TFRequest

fn default() -> TFRequest

impl Default for TFResponse

fn default() -> TFResponse

impl<'_> Default for &'_ CStr

pub fn default() -> &'_ CStr

impl<'_> Default for &'_ OsStr

pub fn default() -> &'_ OsStr

Creates an empty OsStr.

impl<'_> Default for Chain<'_>

pub fn default() -> Chain<'_>

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

pub fn default() -> Cow<'_, B>

Creates an owned Cow<'a, B> with the default value for the contained owned value.

impl<A> Default for SmallVec<A> where
    A: Array, 

pub fn default() -> SmallVec<A>

impl<A, S, D> Default for ArrayBase<S, D> where
    S: DataOwned<Elem = A>,
    A: Default,
    D: Dimension, 

Create an owned array with a default state.

The array is created with dimension D::default(), which results in for example dimensions 0 and (0, 0) with zero elements for the one-dimensional and two-dimensional cases respectively.

The default dimension for IxDyn is IxDyn(&[0]) (array has zero elements). And the default for the dimension () is () (array has one element).

Since arrays cannot grow, the intention is to use the default value as placeholder.

pub fn default() -> ArrayBase<S, D>

impl<F> Default for Outlet<F> where
    F: Fact + Default + Hash, 

pub fn default() -> Outlet<F>

impl<F, O> Default for Graph<F, O> where
    F: Fact + Hash + Clone + 'static,
    O: Debug + Display + AsRef<dyn Op + 'static> + AsMut<dyn Op + 'static> + Clone + 'static + Hash, 

pub fn default() -> Graph<F, O>

impl<F, O> Default for ModelPatch<F, O> where
    F: Fact + Clone + 'static + Hash,
    O: Display + Debug + AsRef<dyn Op + 'static> + AsMut<dyn Op + 'static> + Clone + 'static + Hash, 

pub fn default() -> ModelPatch<F, O>

impl<H> Default for BuildHasherDefault<H>

pub fn default() -> BuildHasherDefault<H>

impl<I> Default for Dim<I> where
    I: Default + ?Sized, 

pub fn default() -> Dim<I>

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

pub fn default() -> Range<Idx>

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

pub fn default() -> BTreeMap<K, V>

Creates an empty BTreeMap.

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<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 Arc<T> where
    T: Default, 

pub fn default() -> Arc<T>

Creates a new Arc<T>, with the Default value for T.

Examples

use std::sync::Arc;

let x: Arc<i32> = Default::default();
assert_eq!(*x, 0);

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

pub fn default() -> OutletMap<T>

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

pub fn default() -> PhantomData<T>

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

pub fn default() -> Rc<T>

Creates a new Rc<T>, with the Default value for T.

Examples

use std::rc::Rc;

let x: Rc<i32> = Default::default();
assert_eq!(*x, 0);

impl<T> Default for orkhon::prelude::ops::nn::tract_data::internal::tract_smallvec::alloc::rc::Weak<T>

pub fn default() -> Weak<T>

Constructs a new Weak<T>, allocating memory for T without initializing it. Calling upgrade on the return value always gives None.

Examples

use std::rc::Weak;

let empty: Weak<i64> = Default::default();
assert!(empty.upgrade().is_none());

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

pub fn default() -> Cell<T>

Creates a Cell<T>, with the Default value for T.

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

pub fn default() -> RefCell<T>

Creates a RefCell<T>, with the Default value for T.

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

pub fn default() -> UnsafeCell<T>

Creates an UnsafeCell, with the Default value for T.

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

pub fn default() -> Reverse<T>

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

pub fn default() -> BTreeSet<T>

Creates an empty BTreeSet.

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<T> Default for VecDeque<T>

pub fn default() -> VecDeque<T>

Creates an empty VecDeque<T>.

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

pub fn default() -> Cursor<T>

impl<T> Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::lazy::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<T> Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::lazy::OnceCell<T>

pub fn default() -> OnceCell<T>

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 SyncOnceCell<T>

pub fn default() -> SyncOnceCell<T>

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

pub fn default() -> ManuallyDrop<T>

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

pub fn default() -> Wrapping<T>

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

pub fn default() -> Box<[T], Global>

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

pub fn default() -> Box<T, Global>

Creates a Box<T>, with the Default value for T.

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

pub fn default() -> Vec<T, Global>

Creates an empty Vec<T>.

impl<T> Default for AtomicPtr<T>

pub fn default() -> AtomicPtr<T>

Creates a null AtomicPtr<T>.

impl<T> Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::sync::Mutex<T> where
    T: Default + ?Sized, 

pub fn default() -> Mutex<T>

Creates a Mutex<T>, with the Default value for T.

impl<T> Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::sync::RwLock<T> where
    T: Default, 

pub fn default() -> RwLock<T>

Creates a new RwLock<T>, with the Default value for T.

impl<T> Default for orkhon::prelude::ops::nn::tract_downcast_rs::__std::sync::Weak<T>

pub fn default() -> Weak<T>

Constructs a new Weak<T>, without allocating memory. Calling upgrade on the return value always gives None.

Examples

use std::sync::Weak;

let empty: Weak<i64> = Default::default();
assert!(empty.upgrade().is_none());

impl<T> Default for Empty<T>

pub fn default() -> Empty<T>

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<TI> Default for ScratchSpaceFusedNonLinear<TI> where
    TI: Copy, 

pub fn default() -> ScratchSpaceFusedNonLinear<TI>

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