Trait parity_scale_codec::Decode

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pub trait Decode: Sized {
    // Required method
    fn decode<I: Input>(input: &mut I) -> Result<Self, Error>;

    // Provided methods
    fn decode_into<I: Input>(
        input: &mut I,
        dst: &mut MaybeUninit<Self>,
    ) -> Result<DecodeFinished, Error> { ... }
    fn skip<I: Input>(input: &mut I) -> Result<(), Error> { ... }
    fn encoded_fixed_size() -> Option<usize> { ... }
}
Expand description

Trait that allows zero-copy read of value-references from slices in LE format.

Required Methods§

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

Attempt to deserialise the value from input.

Provided Methods§

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fn decode_into<I: Input>( input: &mut I, dst: &mut MaybeUninit<Self>, ) -> Result<DecodeFinished, Error>

Attempt to deserialize the value from input into a pre-allocated piece of memory.

The default implementation will just call Decode::decode.

§Safety

If this function returns Ok then dst must be properly initialized.

This is enforced by requiring the implementation to return a DecodeFinished which can only be created by calling DecodeFinished::assert_decoding_finished which is unsafe.

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fn skip<I: Input>(input: &mut I) -> Result<(), Error>

Attempt to skip the encoded value from input.

The default implementation of this function is just calling Decode::decode. When possible, an implementation should provide a specialized implementation.

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fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

If it returns Some(size) then all possible values of this type have the given size (in bytes) when encoded.

NOTE: A type with a fixed encoded size may return None.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl Decode for bool

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impl Decode for f32

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impl Decode for f64

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impl Decode for i8

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for i16

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impl Decode for i32

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impl Decode for i64

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impl Decode for i128

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impl Decode for u8

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for u16

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impl Decode for u32

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impl Decode for u64

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impl Decode for u128

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impl Decode for ()

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impl Decode for Bytes

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for String

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for Duration

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroI8

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroI16

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroI32

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroI64

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroI128

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroU8

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroU16

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroU32

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroU64

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl Decode for NonZeroU128

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<'a, T: ToOwned + ?Sized> Decode for Cow<'a, T>
where <T as ToOwned>::Owned: Decode,

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<A0: Decode, B0: Decode, C0: Decode, D0: Decode, E0: Decode, F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (A0, B0, C0, D0, E0, F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<B0: Decode, C0: Decode, D0: Decode, E0: Decode, F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (B0, C0, D0, E0, F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<C0: Decode, D0: Decode, E0: Decode, F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (C0, D0, E0, F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<D0: Decode, E0: Decode, F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (D0, E0, F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<E0: Decode, F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (E0, F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<F0: Decode, G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (F0, G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<G0: Decode, H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (G0, H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<H0: Decode, I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (H0, I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<I0: Decode, J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (I0, J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<J0: Decode, K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (J0, K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<K0: Decode, L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (K0, L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<K: Decode + Ord, V: Decode> Decode for BTreeMap<K, V>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<L0: Decode, M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (L0, M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<M0: Decode, N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (M0, N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<N0: Decode, O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (N0, O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<O0: Decode, P0: Decode, Q0: Decode, R0: Decode> Decode for (O0, P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<O: BitOrder, T: BitStore + Decode> Decode for BitBox<T, O>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<O: BitOrder, T: BitStore + Decode> Decode for BitVec<T, O>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<P0: Decode, Q0: Decode, R0: Decode> Decode for (P0, Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<Q0: Decode, R0: Decode> Decode for (Q0, R0)

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fn decode<INPUT: Input>(input: &mut INPUT) -> Result<Self, Error>

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impl<R0: Decode> Decode for (R0,)

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T> Decode for PhantomData<T>

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fn decode<I: Input>(_input: &mut I) -> Result<Self, Error>

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impl<T> Decode for Range<T>
where T: Decode,

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T> Decode for RangeInclusive<T>
where T: Decode,

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode + Ord> Decode for BinaryHeap<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode + Ord> Decode for BTreeSet<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode> Decode for Option<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode> Decode for LinkedList<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode> Decode for VecDeque<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode> Decode for Vec<T>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode, E: Decode> Decode for Result<T, E>

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fn decode<I: Input>(input: &mut I) -> Result<Self, Error>

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impl<T: Decode, const N: usize> Decode for [T; N]

Implementors§