Struct chalk_ir::Substitution

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pub struct Substitution<I: Interner> {
    pub(crate) interned: I::InternedSubstitution,
}
Expand description

List of interned elements.

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§interned: I::InternedSubstitution

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impl<I: Interner> Substitution<I>

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pub fn debug(&self, interner: I) -> SubstitutionDebug<'_, I>

Show debug output for the substitution.

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impl<I: Interner> Substitution<I>

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pub fn with_angle(&self, interner: I) -> Angle<'_, GenericArg<I>>

Displays the substitution in the form < P0, .. Pn >, or (if the substitution is empty) as an empty string.

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impl<I: Interner> Substitution<I>

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pub fn is_identity_subst(&self, interner: I) -> bool

A substitution is an identity substitution if it looks like this

?0 := ?0
?1 := ?1
?2 := ?2
...

Basically, each value is mapped to a type or lifetime with its same index.

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pub fn apply<T>(&self, value: T, interner: I) -> T
where T: TypeFoldable<I>,

Apply the substitution to a value.

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pub fn type_parameters(&self, interner: I) -> impl Iterator<Item = Ty<I>> + '_

Gets an iterator of all type parameters.

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pub(crate) fn compute_flags(&self, interner: I) -> TypeFlags

Compute type flags for Substitution

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impl<I: Interner> Substitution<I>

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pub fn interned(&self) -> &I::InternedSubstitution

Get the interned elements.

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pub fn as_slice(&self, interner: I) -> &[GenericArg<I>]

Returns a slice containing the elements.

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pub fn at(&self, interner: I, index: usize) -> &GenericArg<I>

Index into the sequence.

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pub fn empty(interner: I) -> Self

Create an empty sequence.

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pub fn is_empty(&self, interner: I) -> bool

Check whether this is an empty sequence.

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pub fn iter(&self, interner: I) -> Iter<'_, GenericArg<I>>

Get an iterator over the elements of the sequence.

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pub fn len(&self, interner: I) -> usize

Get the length of the sequence.

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impl<I: Interner> Substitution<I>

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pub fn from_fallible<E>( interner: I, elements: impl IntoIterator<Item = Result<impl CastTo<GenericArg<I>>, E>> ) -> Result<Self, E>

Tries to create a sequence using an iterator of element-like things.

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pub fn from_iter( interner: I, elements: impl IntoIterator<Item = impl CastTo<GenericArg<I>>> ) -> Self

Create a sequence from elements

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pub fn from1(interner: I, element: impl CastTo<GenericArg<I>>) -> Self

Create a sequence from a single element.

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impl<I: Interner> AsParameters<I> for Substitution<I>

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fn as_parameters(&self, interner: I) -> &[GenericArg<I>]

Convert the current value to parameters.
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impl<I: Clone + Interner> Clone for Substitution<I>

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fn clone(&self) -> Substitution<I>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<I: Interner> Debug for Substitution<I>

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

Formats the value using the given formatter. Read more
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impl<I: Interner> Display for Substitution<I>

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

Formats the value using the given formatter. Read more
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impl<I: Interner> HasInterner for Substitution<I>

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type Interner = I

The interner associated with the type.
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impl<I: Hash + Interner> Hash for Substitution<I>

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<I: Ord + Interner> Ord for Substitution<I>

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fn cmp(&self, other: &Substitution<I>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<I: PartialEq + Interner> PartialEq for Substitution<I>

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fn eq(&self, other: &Substitution<I>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<I: PartialOrd + Interner> PartialOrd for Substitution<I>

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<I: Interner> TypeFoldable<I> for Substitution<I>

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fn try_fold_with<E>( self, folder: &mut dyn FallibleTypeFolder<I, Error = E>, outer_binder: DebruijnIndex ) -> Result<Self, E>

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.
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fn fold_with( self, folder: &mut dyn TypeFolder<I>, outer_binder: DebruijnIndex ) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<I: Interner> TypeVisitable<I> for Substitution<I>

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fn visit_with<B>( &self, visitor: &mut dyn TypeVisitor<I, BreakTy = B>, outer_binder: DebruijnIndex ) -> ControlFlow<B>

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.
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impl<I: Copy + Interner> Copy for Substitution<I>

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impl<I: Eq + Interner> Eq for Substitution<I>

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impl<I: Interner> StructuralEq for Substitution<I>

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impl<I: Interner> StructuralPartialEq for Substitution<I>

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Cast for T

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fn cast<U>(self, interner: U::Interner) -> U
where Self: CastTo<U>, U: HasInterner,

Cast a value to type U using CastTo.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T, I> Shift<I> for T
where T: TypeFoldable<I>, I: Interner,

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fn shifted_in(self, interner: I) -> T

Shifts this term in one level of binders.
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fn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T

Shifts a term valid at outer_binder so that it is valid at the innermost binder. See DebruijnIndex::shifted_in_from for a detailed explanation.
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fn shifted_out_to( self, interner: I, target_binder: DebruijnIndex ) -> Result<T, NoSolution>

Shifts a term valid at the innermost binder so that it is valid at outer_binder. See DebruijnIndex::shifted_out_to for a detailed explanation.
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fn shifted_out(self, interner: I) -> Result<T, NoSolution>

Shifts this term out one level of binders.
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impl<I, A> Substitute<I> for A
where I: Interner, A: AsParameters<I>,

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fn apply<T>(&self, value: T, interner: I) -> T
where T: TypeFoldable<I>,

Apply the substitution to a value.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, I> VisitExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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fn has_free_vars(&self, interner: I) -> bool

Check whether there are free (non-bound) variables.