[][src]Struct rustc_metadata::schema::Lazy

#[must_use]
pub struct Lazy<T> { pub position: usize, _marker: PhantomData<T>, }
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A value of type T referred to by its absolute position in the metadata, and which can be decoded lazily.

Metadata is effective a tree, encoded in post-order, and with the root's position written next to the header. That means every single Lazy points to some previous location in the metadata and is part of a larger node.

The first Lazy in a node is encoded as the backwards distance from the position where the containing node starts and where the Lazy points to, while the rest use the forward distance from the previous Lazy. Distances start at 1, as 0-byte nodes are invalid. Also invalid are nodes being referred in a different order than they were encoded in.

Fields

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🔬 This is a nightly-only experimental API. (rustc_private)

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Methods

impl<'a, 'tcx: 'a, T: Decodable> Lazy<T>
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impl<T> Lazy<T>
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🔬 This is a nightly-only experimental API. (rustc_private)

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Returns the minimum encoded size of a value of type T.

Trait Implementations

impl<'a, 'tcx, T> SpecializedEncoder<Lazy<T>> for EncodeContext<'a, 'tcx>
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Encode the value in a manner specific to this encoder state.

impl<'a, 'tcx, T> SpecializedDecoder<Lazy<T>> for DecodeContext<'a, 'tcx>
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Decode a value in a manner specific to this decoder state.

impl<T> Copy for Lazy<T>
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impl<T> Clone for Lazy<T>
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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<T> UseSpecializedEncodable for Lazy<T>
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Defaults to returning an error (see SpecializationError).

impl<T> UseSpecializedDecodable for Lazy<T>
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Defaults to returning an error (see SpecializationError).

impl<CTX, T> HashStable<CTX> for Lazy<T>
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Auto Trait Implementations

impl<T> Send for Lazy<T> where
    T: Send

impl<T> Sync for Lazy<T> where
    T: Sync

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone
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Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> From for T
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Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<T> Encodable for T where
    T: UseSpecializedEncodable + ?Sized
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impl<T> Decodable for T where
    T: UseSpecializedDecodable
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impl<E> SpecializationError for E
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T

impl<T> MaybeResult for T
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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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impl<'a, T> Captures for T where
    T: ?Sized
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