Trait tract_hir::internal::tract_downcast_rs::__std::prelude::rust_2018::Default1.0.0[−][src]

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`[src]

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; 28] where T: Default,` [src]

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

`impl<'_> Default for &'_ mut str`[src]

`pub fn default() -> &'_ mut str`[src]

Creates an empty mutable str

`impl Default for ()`[src]

`pub fn default()`[src]

Returns the default value of ()

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default,` [src]

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

`impl Default for i8`[src]

`pub fn default() -> i8`[src]

Returns the default value of 0

`impl<A, B, C, D, E> Default for (A, B, C, D, E) where C: Default, E: Default, A: Default, B: Default, D: Default,` [src]

`pub fn default() -> (A, B, C, D, E)`[src]

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

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

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

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

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

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

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

`pub fn default() -> (A, B, C, D, E, F)`[src]

`impl Default for usize`[src]

`pub fn default() -> usize`[src]

Returns the default value of 0

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

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

`impl Default for f32`[src]

`pub fn default() -> f32`[src]

Returns the default value of 0.0

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

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

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

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

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

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

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

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

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

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

`impl<A> Default for (A,) where A: Default,` [src]

`pub fn default() -> (A,)`[src]

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

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

`impl<A, B> Default for (A, B) where A: Default, B: Default,` [src]

`pub fn default() -> (A, B)`[src]

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

`pub fn default() -> (A, B, C, D, E, F, G)`[src]

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

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

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

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

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

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

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

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

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

`pub fn default() -> &'_ [T]ⓘNotable traits for &'_ [u8] impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]`[src]

Creates an empty slice.

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

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

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default,` [src]

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

`impl Default for u8`[src]

`pub fn default() -> u8`[src]

Returns the default value of 0

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

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

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default,` [src]

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

`impl Default for i16`[src]

`pub fn default() -> i16`[src]

Returns the default value of 0

`impl Default for bool`[src]

`pub fn default() -> bool`[src]

Returns the default value of false

`impl Default for u32`[src]

`pub fn default() -> u32`[src]

Returns the default value of 0

`impl<T> Default for [T; 0]`[src]

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

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

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

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

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

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

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

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

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

`impl Default for i128`[src]

`pub fn default() -> i128`[src]

Returns the default value of 0

`impl<'_> Default for &'_ str`[src]

`pub fn default() -> &'_ str`[src]

Creates an empty str

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

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

`impl Default for u128`[src]

`pub fn default() -> u128`[src]

Returns the default value of 0

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

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

`impl Default for char`[src]

`pub fn default() -> char`[src]

Returns the default value of \x00

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

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

`impl Default for f64`[src]

`pub fn default() -> f64`[src]

Returns the default value of 0.0

`impl<A, B, C> Default for (A, B, C) where C: Default, A: Default, B: Default,` [src]

`pub fn default() -> (A, B, C)`[src]

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

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

`impl Default for u64`[src]

`pub fn default() -> u64`[src]

Returns the default value of 0

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

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

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

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

`impl Default for u16`[src]

`pub fn default() -> u16`[src]

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,` [src]

`pub fn default() -> (A, B, C, D)`[src]

`impl Default for i64`[src]

`pub fn default() -> i64`[src]

Returns the default value of 0

`impl Default for i32`[src]

`pub fn default() -> i32`[src]

Returns the default value of 0

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

`pub fn default() -> &'_ mut [T]ⓘNotable traits for &'_ [u8] impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]`[src]

Creates a mutable empty slice.

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

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

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

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

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

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

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

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

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

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

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, L: Default, J: Default,` [src]

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

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

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

`impl Default for isize`[src]

`pub fn default() -> isize`[src]

Returns the default value of 0

`impl Default for KernelFormat`[src]

`pub fn default() -> KernelFormat`[src]

`impl Default for MultiBroadcastTo`[src]

`pub fn default() -> MultiBroadcastTo`[src]

`impl Default for FiniteReshape`[src]

`pub fn default() -> FiniteReshape`[src]

`impl Default for Tile`[src]

`pub fn default() -> Tile`[src]

`impl Default for BitSet where B: BitBlock,`

`pub fn default() -> BitSet`

`impl Default for BitVec where B: BitBlock,` [src]

`pub fn default() -> BitVec`[src]

`impl<T> Default for Complex<T> where T: Default,` [src]

`pub fn default() -> Complex<T>`[src]

`impl Default for f16`[src]

`pub fn default() -> f16`[src]

`impl Default for bf16`[src]

`pub fn default() -> bf16`[src]

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Implementors

`impl Default for TDim`

`pub fn default() -> TDim`

`impl Default for PadMode`[src]

`pub fn default() -> PadMode`[src]

`impl Default for PaddingSpec`[src]

`pub fn default() -> PaddingSpec`[src]

`impl Default for DataFormat`[src]

`pub fn default() -> DataFormat`[src]

`impl Default for InferenceFact`[src]

`fn default() -> InferenceFact`[src]

`impl Default for ShapeFactoid`[src]

`fn default() -> ShapeFactoid`[src]

Returns the most general shape fact possible.

`impl Default for AxisChangeConsequence`[src]

`pub fn default() -> AxisChangeConsequence`[src]

`impl Default for AxisInfo`[src]

`pub fn default() -> AxisInfo`[src]

`impl Default for Blob`

`pub fn default() -> Blob`

`impl Default for Invariants`[src]

`pub fn default() -> Invariants`[src]

`impl Default for SessionState`[src]

`pub fn default() -> SessionState`[src]

`impl Default for SymbolValues`

`pub fn default() -> SymbolValues`

`impl Default for Tensor`

`pub fn default() -> Tensor`

`impl Default for tract_hir::internal::f16`

`pub fn default() -> f16`

`impl Default for Global`[src]

`pub fn default() -> Global`[src]

`impl Default for Box<str, Global>`1.17.0[src]

`pub fn default() -> Box<str, Global>ⓘNotable traits for Box<R, Global> impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;`[src]

`impl Default for Box<CStr, Global>`1.17.0[src]

`pub fn default() -> Box<CStr, Global>ⓘNotable traits for Box<R, Global> impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;`[src]

`impl Default for Box<OsStr, Global>`1.17.0[src]

`pub fn default() -> Box<OsStr, Global>ⓘNotable traits for Box<R, Global> impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;`[src]

`impl Default for String`[src]

`pub fn default() -> String`[src]

Creates an empty String.

`impl Default for System`1.28.0[src]

`pub fn default() -> System`[src]

`impl Default for DefaultHasher`1.13.0[src]

`pub fn default() -> DefaultHasher`[src]

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

`impl Default for RandomState`1.7.0[src]

`pub fn default() -> RandomState`[src]

Constructs a new RandomState.

`impl Default for CString`1.10.0[src]

`pub fn default() -> CString`[src]

Creates an empty CString.

`impl Default for OsString`1.9.0[src]

`pub fn default() -> OsString`[src]

Constructs an empty OsString.

`impl Default for Error`[src]

`pub fn default() -> Error`[src]

`impl Default for SipHasher`[src]

`pub fn default() -> SipHasher`[src]

`impl Default for PhantomPinned`1.33.0[src]

`pub fn default() -> PhantomPinned`[src]

`impl Default for RangeFull`[src]

`pub fn default() -> RangeFull`[src]

`impl Default for PathBuf`1.17.0[src]

`pub fn default() -> PathBuf`[src]

`impl Default for AtomicBool`[src]

`pub fn default() -> AtomicBool`[src]

Creates an AtomicBool initialized to false.

`impl Default for AtomicI8`1.34.0[src]

`pub fn default() -> AtomicI8`[src]

`impl Default for AtomicI16`1.34.0[src]

`pub fn default() -> AtomicI16`[src]

`impl Default for AtomicI32`1.34.0[src]

`pub fn default() -> AtomicI32`[src]

`impl Default for AtomicI64`1.34.0[src]

`pub fn default() -> AtomicI64`[src]

`impl Default for AtomicIsize`[src]

`pub fn default() -> AtomicIsize`[src]

`impl Default for AtomicU8`1.34.0[src]

`pub fn default() -> AtomicU8`[src]

`impl Default for AtomicU16`1.34.0[src]

`pub fn default() -> AtomicU16`[src]

`impl Default for AtomicU32`1.34.0[src]

`pub fn default() -> AtomicU32`[src]

`impl Default for AtomicU64`1.34.0[src]

`pub fn default() -> AtomicU64`[src]

`impl Default for AtomicUsize`[src]

`pub fn default() -> AtomicUsize`[src]

`impl Default for Condvar`1.10.0[src]

`pub fn default() -> Condvar`[src]

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

`impl Default for Duration`1.3.0[src]

`pub fn default() -> Duration`[src]

`impl Default for IxDynImpl`[src]

`pub fn default() -> IxDynImpl`[src]

`impl Default for ConstantLike`[src]

`fn default() -> ConstantLike`[src]

`impl Default for Crop`[src]

`fn default() -> Crop`[src]

`impl Default for EyeLike`[src]

`fn default() -> EyeLike`[src]

`impl Default for Flatten`[src]

`fn default() -> Flatten`[src]

`impl Default for tract_hir::ops::array::MultiBroadcastTo`[src]

`fn default() -> MultiBroadcastTo`[src]

`impl Default for Pad`[src]

`pub fn default() -> Pad`[src]

`impl Default for Reshape`[src]

`fn default() -> Reshape`[src]

`impl Default for Slice`[src]

`pub fn default() -> Slice`[src]

`impl Default for Split`[src]

`fn default() -> Split`[src]

`impl Default for Squeeze`[src]

`fn default() -> Squeeze`[src]

`impl Default for tract_hir::ops::array::Tile`[src]

`fn default() -> Tile`[src]

`impl Default for Conv`[src]

`fn default() -> Conv`[src]

`impl Default for MaxPool`[src]

`pub fn default() -> MaxPool`[src]

`impl Default for PoolSpec`[src]

`pub fn default() -> PoolSpec`[src]

`impl Default for SumPool`[src]

`pub fn default() -> SumPool`[src]

`impl Default for Downsample`[src]

`pub fn default() -> Downsample`[src]

`impl Default for Identity`[src]

`pub fn default() -> Identity`[src]

`impl Default for Iff`[src]

`pub fn default() -> Iff`[src]

`impl Default for MatMul`[src]

`pub fn default() -> MatMul`[src]

`impl Default for MatMulInference`[src]

`fn default() -> MatMulInference`[src]

`impl Default for LayerHardmax`[src]

`fn default() -> LayerHardmax`[src]

`impl Default for LayerLogSoftmax`[src]

`fn default() -> LayerLogSoftmax`[src]

`impl Default for LayerSoftmax`[src]

`fn default() -> LayerSoftmax`[src]

`impl Default for InferenceScan`[src]

`fn default() -> InferenceScan`[src]

`impl Default for Scan`[src]

`pub fn default() -> Scan`[src]

`impl<'_> Default for &'_ CStr`1.10.0[src]

`pub fn default() -> &'_ CStr`[src]

`impl<'_> Default for &'_ OsStr`1.9.0[src]

`pub fn default() -> &'_ OsStr`[src]

Creates an empty OsStr.

`impl<'_> Default for Chain<'_>`[src]

`pub fn default() -> Chain<'_>ⓘNotable traits for Chain<'a> impl<'a> Iterator for Chain<'a> type Item = &'a (dyn Error + 'static);`[src]

`impl<'_, B> Default for Cow<'_, B> where B: ToOwned + ?Sized, ::Owned: Default,` 1.11.0[src]

`pub fn default() -> Cow<'_, B>`[src]

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

`impl<'rules> Default for Solver<'rules>`[src]

`fn default() -> Solver<'rules>`[src]

`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,` [src]

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>`[src]

`impl<F> Default for Outlet<F> where F: Default + Fact + Hash,` [src]

`pub fn default() -> Outlet<F>`[src]

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

`pub fn default() -> Graph<F, O>`[src]

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

`pub fn default() -> ModelPatch<F, O>`[src]

`impl<H> Default for BuildHasherDefault<H>`1.7.0[src]

`pub fn default() -> BuildHasherDefault<H>`[src]

`impl Default for Dim where I: Default + ?Sized,` [src]

`pub fn default() -> Dim`[src]

`impl<Idx> Default for Range<Idx> where Idx: Default,` [src]

`pub fn default() -> Range<Idx>ⓘNotable traits for Range<A> impl<A> Iterator for Range<A> where A: Step, type Item = A;`[src]

`impl<K, V> Default for BTreeMap<K, V> where K: Ord,` [src]

`pub fn default() -> BTreeMap<K, V>`[src]

Creates an empty BTreeMap.

`impl<K, V, S> Default for HashMap<K, V, S> where S: Default,` [src]

`pub fn default() -> HashMap<K, V, S>`[src]

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

`impl<T> Default for Option<T>`[src]

`pub fn default() -> Option<T>`[src]

Returns None.

Examples

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

`impl<T> Default for Arc<T> where T: Default,` [src]

`pub fn default() -> Arc<T>`[src]

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,` [src]

`pub fn default() -> OutletMap<T>`[src]

`impl<T> Default for PhantomData<T> where T: ?Sized,` [src]

`pub fn default() -> PhantomData<T>`[src]

`impl<T> Default for BTreeSet<T> where T: Ord,` [src]

`pub fn default() -> BTreeSet<T>`[src]

Creates an empty BTreeSet.

`impl<T> Default for BinaryHeap<T> where T: Ord,` [src]

`pub fn default() -> BinaryHeap<T>`[src]

Creates an empty BinaryHeap<T>.

`impl<T> Default for LinkedList<T>`[src]

`pub fn default() -> LinkedList<T>`[src]

Creates an empty LinkedList<T>.

`impl<T> Default for VecDeque<T>`[src]

`pub fn default() -> VecDeque<T>`[src]

Creates an empty VecDeque<T>.

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

`pub fn default() -> Box<[T], Global>ⓘNotable traits for Box<R, Global> impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;`[src]

`impl<T> Default for Box<T, Global> where T: Default,` [src]

`pub fn default() -> Box<T, Global>ⓘNotable traits for Box<R, Global> impl<R> Read for Box<R, Global> where R: Read + ?Sized, impl<W> Write for Box<W, Global> where W: Write + ?Sized, impl<F, A> Future for Box<F, A> where F: Future + Unpin + ?Sized, A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where I: Iterator + ?Sized, A: Allocator, type Item = ::Item;`[src]

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

`impl<T> Default for Vec<T, Global>`[src]

`pub fn default() -> Vec<T, Global>ⓘNotable traits for Vec<u8, A> impl<A> Write for Vec<u8, A> where A: Allocator,` [src]

Creates an empty Vec<T>.

`impl<T> Default for tract_hir::internal::tract_downcast_rs::__alloc::sync::Weak<T>`1.10.0[src]

`pub fn default() -> Weak<T>`[src]

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 Cell<T> where T: Default,` [src]

`pub fn default() -> Cell<T>`[src]

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

`impl<T> Default for RefCell<T> where T: Default,` [src]

`pub fn default() -> RefCell<T>`[src]

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

`impl<T> Default for UnsafeCell<T> where T: Default,` 1.10.0[src]

`pub fn default() -> UnsafeCell<T>`[src]

Creates an UnsafeCell, with the Default value for T.

`impl<T> Default for Reverse<T> where T: Default,` 1.19.0[src]

`pub fn default() -> Reverse<T>`[src]

`impl<T> Default for Cursor<T> where T: Default,` [src]

`pub fn default() -> Cursor<T>ⓘNotable traits for Cursor<T> impl<T> Read for Cursor<T> where T: AsRef<[u8]>, impl<'_> Write for Cursor<&'_ mut [u8]>impl Write for Cursor<Vec<u8, Global>>impl Write for Cursor<Box<[u8], Global>>impl<'_> Write for Cursor<&'_ mut Vec<u8, Global>>`[src]

`impl<T> Default for Empty<T>`1.2.0[src]

`pub fn default() -> Empty<T>ⓘNotable traits for Empty<T> impl<T> Iterator for Empty<T> type Item = T;`[src]

`impl<T> Default for Lazy<T, fn() -> T> where T: Default,` [src]

`pub fn default() -> Lazy<T, fn() -> T>`[src]

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

`impl<T> Default for OnceCell<T>`[src]

`pub fn default() -> OnceCell<T>`[src]

`impl<T> Default for SyncLazy<T, fn() -> T> where T: Default,` [src]

`pub fn default() -> SyncLazy<T, fn() -> T>`[src]

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

`impl<T> Default for SyncOnceCell<T>`[src]

`pub fn default() -> SyncOnceCell<T>`[src]

`impl<T> Default for ManuallyDrop<T> where T: Default + ?Sized,` 1.20.0[src]

`pub fn default() -> ManuallyDrop<T>`[src]

`impl<T> Default for Wrapping<T> where T: Default,` [src]

`pub fn default() -> Wrapping<T>`[src]

`impl<T> Default for Rc<T> where T: Default,` [src]

`pub fn default() -> Rc<T>`[src]

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 tract_hir::internal::tract_downcast_rs::__std::rc::Weak<T>`1.10.0[src]

`pub fn default() -> Weak<T>`[src]

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 AtomicPtr<T>`[src]

`pub fn default() -> AtomicPtr<T>`[src]

Creates a null AtomicPtr<T>.

`impl<T> Default for Mutex<T> where T: Default + ?Sized,` 1.10.0[src]

`pub fn default() -> Mutex<T>`[src]

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

`impl<T> Default for RwLock<T> where T: Default,` 1.10.0[src]

`pub fn default() -> RwLock<T>`[src]

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

`impl<T, S> Default for HashSet<T, S> where S: Default,` [src]

`pub fn default() -> HashSet<T, S>`[src]

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

`impl<T: Debug + Clone + PartialEq + Hash> Default for GenericFactoid<T>`[src]

`fn default() -> Self`[src]

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

`pub fn default() -> ScratchSpaceFusedNonLinear<TI>`

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Trait tract_hir::internal::tract_downcast_rs::__std::prelude::rust_2018::Default1.0.0[−][src]

Derivable

How can I implement Default?

Examples

Required methods

pub fn default() -> Self[src]

Examples

Implementations on Foreign Types

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

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

impl<'_> Default for &'_ mut str[src]

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

impl Default for ()[src]

pub fn default()[src]

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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default, [src]

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

impl Default for i8[src]

pub fn default() -> i8[src]

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

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

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

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

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

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

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

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

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

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

impl Default for usize[src]

pub fn default() -> usize[src]

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

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

impl Default for f32[src]

pub fn default() -> f32[src]

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

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

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

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

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

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

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

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

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

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

impl<A> Default for (A,) where A: Default, [src]

pub fn default() -> (A,)[src]

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

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

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

pub fn default() -> (A, B)[src]

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

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

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

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

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

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

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

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

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

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

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

pub fn default() -> &'_ [T]ⓘNotable traits for &'_ [u8]impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8][src]

Notable traits for &'_ [u8]

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

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

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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default, [src]

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

impl Default for u8[src]

pub fn default() -> u8[src]

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

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

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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, [src]

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

impl Default for i16[src]

pub fn default() -> i16[src]

impl Default for bool[src]

pub fn default() -> bool[src]

impl Default for u32[src]

pub fn default() -> u32[src]

impl<T> Default for [T; 0][src]

How can I implement `Default`?

`pub fn default() -> Self`[src]

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

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

`impl<'_> Default for &'_ mut str`[src]

`pub fn default() -> &'_ mut str`[src]

`impl Default for ()`[src]

`pub fn default()`[src]

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default,` [src]

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

`impl Default for i8`[src]

`pub fn default() -> i8`[src]

`impl<A, B, C, D, E> Default for (A, B, C, D, E) where C: Default, E: Default, A: Default, B: Default, D: Default,` [src]

`pub fn default() -> (A, B, C, D, E)`[src]

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

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

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

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

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

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

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

`pub fn default() -> (A, B, C, D, E, F)`[src]

`impl Default for usize`[src]

`pub fn default() -> usize`[src]

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

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

`impl Default for f32`[src]

`pub fn default() -> f32`[src]

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

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

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

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

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

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

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

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

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

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

`impl<A> Default for (A,) where A: Default,` [src]

`pub fn default() -> (A,)`[src]

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

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

`impl<A, B> Default for (A, B) where A: Default, B: Default,` [src]

`pub fn default() -> (A, B)`[src]

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

`pub fn default() -> (A, B, C, D, E, F, G)`[src]

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

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

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

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

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

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

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

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

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

`pub fn default() -> &'_ [T]ⓘNotable traits for &'_ [u8] impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]`[src]

Notable traits for &'_ [u8 ]

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

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

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default, J: Default,` [src]

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

`impl Default for u8`[src]

`pub fn default() -> u8`[src]

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

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

`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, F: Default, E: Default, A: Default, B: Default, D: Default, H: Default, G: Default,` [src]

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

`impl Default for i16`[src]

`pub fn default() -> i16`[src]

`impl Default for bool`[src]

`pub fn default() -> bool`[src]

`impl Default for u32`[src]

`pub fn default() -> u32`[src]

`impl<T> Default for [T; 0]`[src]

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

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

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

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

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

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