Type Alias ProvidedValue

pub type ProvidedValue<'tcx> = Constness;

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> {
    Const,
    NotConst,
}

Variants

Const

NotConst

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:

• Const: 0 bytes
• NotConst: 0 bytes

Trait Implementations

impl Clone for Constness

fn clone(&self) -> Constness

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Constness

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

Formats the value using the given formatter.

impl<__D> Decodable<__D> for Constness

where __D: SpanDecoder,

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

impl Display for Constness

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

Formats the value using the given formatter.

impl<__E> Encodable<__E> for Constness

where __E: SpanEncoder,

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

impl EraseType for Constness

type Result = [u8; 1]

impl<__CTX> HashStable<__CTX> for Constness

where __CTX: HashStableContext,

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

impl ParameterizedOverTcx for Constness

type Value<'tcx> = Constness

impl PartialEq for Constness

fn eq(&self, other: &Constness) -> 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 Constness

impl Eq for Constness

impl StructuralPartialEq for Constness