Struct chalk_ir::PlaceholderIndex

pub struct PlaceholderIndex {
    pub ui: UniverseIndex,
    pub idx: usize,
}

Index of an universally quantified parameter in the environment. Two indexes are required, the one of the universe itself and the relative index inside the universe.

Fields

ui: UniverseIndex

Index of the universe.

idx: usize

Index in the universe.

Implementations

impl PlaceholderIndex

pub fn to_lifetime<I: Interner>(self, interner: &I) -> Lifetime<I>

Wrap the placeholder instance in a lifetime.

pub fn to_ty<I: Interner>(self, interner: &I) -> Ty<I>

Create an interned type.

pub fn to_const<I: Interner>(self, interner: &I, ty: Ty<I>) -> Const<I>

Wrap the placeholder index in a constant.

Trait Implementations

impl Clone for PlaceholderIndex

fn clone(&self) -> PlaceholderIndex

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for PlaceholderIndex

impl Debug for PlaceholderIndex

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

Formats the value using the given formatter.

impl Eq for PlaceholderIndex

impl<I: Interner, TI: TargetInterner<I>> Fold<I, TI> for PlaceholderIndex

type Result = Self

The type of value that will be produced once folding is done. Typically this is Self, unless Self contains borrowed values, in which case owned values are produced (for example, one can fold over a &T value where T: Fold, in which case you get back a T, not a &T).

fn fold_with<'i>(
    &self,
    _folder: &mut dyn Folder<'i, I, TI>,
    _outer_binder: DebruijnIndex
) -> Fallible<Self::Result> where
    I: 'i,
    TI: 'i, 

Apply the given folder folder to self; binders is the number of binders that are in scope when beginning the folder. Typically binders starts as 0, but is adjusted when we encounter Binders<T> in the IR or other similar constructs.

impl Hash for PlaceholderIndex

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl Ord for PlaceholderIndex

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

This method returns an Ordering between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

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

Restrict a value to a certain interval.

impl PartialEq<PlaceholderIndex> for PlaceholderIndex

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialOrd<PlaceholderIndex> for PlaceholderIndex

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

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

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

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

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

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

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

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

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

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

impl StructuralEq for PlaceholderIndex

impl StructuralPartialEq for PlaceholderIndex

impl<I: Interner> Visit<I> for PlaceholderIndex

fn visit_with<'i, R: VisitResult>(
    &self,
    _visitor: &mut dyn Visitor<'i, I, Result = R>,
    _outer_binder: DebruijnIndex
) -> R where
    I: 'i, 

Apply the given visitor visitor to self; binders is the number of binders that are in scope when beginning the visitor. Typically binders starts as 0, but is adjusted when we encounter Binders<T> in the IR or other similar constructs.

impl<I: Interner> Zip<I> for PlaceholderIndex

fn zip_with<'i, Z: Zipper<'i, I>>(
    _zipper: &mut Z,
    a: &Self,
    b: &Self
) -> Fallible<()> where
    I: 'i, 

Uses the zipper to walk through two values, ensuring that they match.