Type Alias ProvidedValue

pub type ProvidedValue<'tcx> = Defaultness;

This type alias specifies the type returned from query providers and the type used for decoding. For regular queries this is the declared returned type V, but arena_cache will use <V as Deref>::Target instead.

Aliased Type

enum ProvidedValue<'tcx> {
    Default {
        has_value: bool,
    },
    Final,
}

Variants

Default

Fields

has_value: bool

Final

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: 1 byte

Size for each variant:

• Default: 1 byte
• Final: 0 bytes

Implementations

impl Defaultness

pub fn has_value(&self) -> bool

pub fn is_final(&self) -> bool

pub fn is_default(&self) -> bool

Trait Implementations

impl Clone for Defaultness

fn clone(&self) -> Defaultness

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Defaultness

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<__D> Decodable<__D> for Defaultness

where __D: SpanDecoder,

fn decode(__decoder: &mut __D) -> Defaultness

impl<__E> Encodable<__E> for Defaultness

where __E: SpanEncoder,

fn encode(&self, __encoder: &mut __E)

impl EraseType for Defaultness

type Result = [u8; 1]

impl<__CTX> HashStable<__CTX> for Defaultness

where __CTX: HashStableContext,

fn hash_stable( &self, __hcx: &mut __CTX, __hasher: &mut StableHasher<SipHasher128>, )

impl ParameterizedOverTcx for Defaultness

type Value<'tcx> = Defaultness

impl PartialEq for Defaultness

fn eq(&self, other: &Defaultness) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Defaultness

impl Eq for Defaultness

impl StructuralPartialEq for Defaultness