Struct rustc::hir::def_id::DefIndex [] [src]

pub struct DefIndex(_);
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A DefIndex is an index into the hir-map for a crate, identifying a particular definition. It should really be considered an interned shorthand for a particular DefPath.

At the moment we are allocating the numerical values of DefIndexes into two ranges: the "low" range (starting at zero) and the "high" range (starting at DEF_INDEX_HI_START). This allows us to allocate the DefIndexes of all item-likes (Items, TraitItems, and ImplItems) into one of these ranges and consequently use a simple array for lookup tables keyed by DefIndex and known to be densely populated. This is especially important for the HIR map.

Since the DefIndex is mostly treated as an opaque ID, you probably don't have to care about these ranges.

Methods

impl DefIndex
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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)

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?

[src]

🔬 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?

[src]

🔬 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?

[src]

🔬 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?

[src]

🔬 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?

Converts this DefIndex into a zero-based array index. This index is the offset within the given "range" of the DefIndex, that is, if the DefIndex is part of the "high" range, the resulting index will be (DefIndex - DEF_INDEX_HI_START).

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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?

Trait Implementations

impl Clone for DefIndex
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl Eq for DefIndex
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impl Ord for DefIndex
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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl PartialOrd for DefIndex
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl PartialEq for DefIndex
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl Encodable for DefIndex
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🔬 This is a nightly-only experimental API. (rustc_private)

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impl Decodable for DefIndex
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impl Hash for DefIndex
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl Copy for DefIndex
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impl Idx for DefIndex
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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 Debug for DefIndex
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Formats the value using the given formatter.

impl<'gcx> HashStable<StableHashingContext<'gcx>> for DefIndex
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impl<'gcx> ToStableHashKey<StableHashingContext<'gcx>> for DefIndex
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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 Key for DefIndex
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Given an instance of this key, what crate is it referring to? This is used to find the provider. Read more

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

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In the event that a cycle occurs, if no explicit span has been given for a query with key self, what span should we use? Read more