pub enum TaskDepsRef<'a, K: DepKind> {
    Allow(&'a Lock<TaskDeps<K>>),
    Ignore,
    Forbid,
}

Variants

Allow(&'a Lock<TaskDeps<K>>)

New dependencies can be added to the TaskDeps. This is used when executing a ‘normal’ query (no eval_always modifier)

Ignore

New dependencies are ignored. This is used when executing an eval_always query, since there’s no need to track dependencies for a query that’s always re-executed. This is also used for dep_graph.with_ignore

Forbid

Any attempt to add new dependencies will cause a panic. This is used when decoding a query result from disk, to ensure that the decoding process doesn’t itself require the execution of any queries.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes

Size for each variant:

  • Allow: 8 bytes
  • Ignore: 0 bytes
  • Forbid: 0 bytes