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

#[must_use]
pub struct Lazy<T> { pub position: usize, _marker: PhantomData<T>, }
🔬 This is a nightly-only experimental API. (rustc_private)

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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

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

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Methods

impl<'a, 'tcx: 'a, T: Decodable> Lazy<T>
[src]

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

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impl<T> Lazy<T>
[src]

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

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

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

Trait Implementations

impl<'a, 'tcx, T> SpecializedEncoder<Lazy<T>> for EncodeContext<'a, 'tcx>
[src]

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

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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>
[src]

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

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Decode a value in a manner specific to this decoder state.

impl<T> Copy for Lazy<T>
[src]

impl<T> Clone for Lazy<T>
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<T> UseSpecializedEncodable for Lazy<T>
[src]

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

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Defaults to returning an error (see SpecializationError).

impl<T> UseSpecializedDecodable for Lazy<T>
[src]

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

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Defaults to returning an error (see SpecializationError).

impl<CTX, T> HashStable<CTX> for Lazy<T>
[src]

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

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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