Enum PredicatePolarity

pub enum PredicatePolarity {
    Positive,
    Negative,
}

Polarity for a trait predicate. May either be negative or positive. Distinguished from ImplPolarity since we never compute goals with “reservation” level.

Variants

Positive

Type: Trait

Negative

Type: !Trait

Implementations

impl PredicatePolarity

pub fn flip(&self) -> PredicatePolarity

Flips polarity by turning Positive into Negative and Negative into Positive.

Trait Implementations

impl Clone for PredicatePolarity

fn clone(&self) -> PredicatePolarity

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PredicatePolarity

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

Formats the value using the given formatter.

impl<__D> Decodable<__D> for PredicatePolarity

where __D: TyDecoder,

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

impl Display for PredicatePolarity

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

Formats the value using the given formatter.

impl<__E> Encodable<__E> for PredicatePolarity

where __E: TyEncoder,

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

impl Hash for PredicatePolarity

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<__CTX> HashStable<__CTX> for PredicatePolarity

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

impl<'tcx> Lift<TyCtxt<'tcx>> for PredicatePolarity

type Lifted = PredicatePolarity

fn lift_to_interner(self, _: TyCtxt<'tcx>) -> Option<PredicatePolarity>

impl Ord for PredicatePolarity

fn cmp(&self, other: &PredicatePolarity) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PredicatePolarity

fn eq(&self, other: &PredicatePolarity) -> 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 PartialOrd for PredicatePolarity

fn partial_cmp(&self, other: &PredicatePolarity) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<I> Relate<I> for PredicatePolarity

where I: Interner,

fn relate<R>( _relation: &mut R, a: PredicatePolarity, b: PredicatePolarity, ) -> Result<PredicatePolarity, TypeError<I>>

where R: TypeRelation<I>,

impl<I> TypeFoldable<I> for PredicatePolarity

where I: Interner,

fn try_fold_with<F>( self, _: &mut F, ) -> Result<PredicatePolarity, <F as FallibleTypeFolder<I>>::Error>

where F: FallibleTypeFolder<I>,

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F>(self, _: &mut F) -> PredicatePolarity

where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<I> TypeVisitable<I> for PredicatePolarity

where I: Interner,

fn visit_with<F>(&self, _: &mut F) -> <F as TypeVisitor<I>>::Result

where F: TypeVisitor<I>,

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

impl Copy for PredicatePolarity

impl Eq for PredicatePolarity

impl StructuralPartialEq for PredicatePolarity

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:

• Positive: 0 bytes
• Negative: 0 bytes