Struct chalk_solve::goal_builder::GoalBuilder

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pub struct GoalBuilder<'i, I: Interner> {
    db: &'i dyn RustIrDatabase<I>,
}

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§db: &'i dyn RustIrDatabase<I>

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impl<'i, I: Interner> GoalBuilder<'i, I>

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pub fn new(db: &'i dyn RustIrDatabase<I>) -> Self

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pub fn db(&self) -> &'i dyn RustIrDatabase<I>

Returns the database within the goal builder.

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pub fn interner(&self) -> I

Returns the interner within the goal builder.

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pub fn all<GS, G>(&mut self, goals: GS) -> Goal<I>
where GS: IntoIterator<Item = G>, G: CastTo<Goal<I>>,

Creates a goal that ensures all of the goals from the goals iterator are met (e.g., goals[0] && ... && goals[N]).

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pub fn implies<CS, C, G>( &mut self, clauses: CS, goal: impl FnOnce(&mut Self) -> G, ) -> Goal<I>
where CS: IntoIterator<Item = C>, C: CastTo<ProgramClause<I>>, G: CastTo<Goal<I>>,

Creates a goal clauses => goal. The clauses are given as an iterator and the goal is returned via the contained closure.

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pub fn forall<G, B, P>( &mut self, binders: &Binders<B>, passthru: P, body: fn(_: &mut Self, _: Substitution<I>, _: &B, _: P) -> G, ) -> Goal<I>
where B: HasInterner<Interner = I>, P: TypeFoldable<I>, G: CastTo<Goal<I>>,

Given a bound value binders like <P0..Pn> V, creates a goal forall<Q0..Qn> { G } where the goal G is created by invoking a helper function body.

§Parameters to body

body will be invoked with:

  • the goal builder self
  • the substitution Q0..Qn
  • the bound value [P0..Pn => Q0..Qn] V instantiated with the substitution
  • the value passthru, appropriately shifted so that any debruijn indices within account for the new binder
§Why is body a function and not a closure?

This is to ensure that body doesn’t accidentally reference values from the environment whose debruijn indices do not account for the new binder being created.

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pub fn exists<G, B, P>( &mut self, binders: &Binders<B>, passthru: P, body: fn(_: &mut Self, _: Substitution<I>, _: &B, _: P) -> G, ) -> Goal<I>
where B: HasInterner<Interner = I>, P: TypeFoldable<I>, G: CastTo<Goal<I>>,

Like GoalBuilder::forall, but for a exists<Q0..Qn> { G } goal.

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fn quantified<G, B, P>( &mut self, quantifier_kind: QuantifierKind, binders: &Binders<B>, passthru: P, body: fn(_: &mut Self, _: Substitution<I>, _: &B, _: P) -> G, ) -> Goal<I>
where B: HasInterner<Interner = I>, P: TypeFoldable<I>, G: CastTo<Goal<I>>,

A combined helper functon for the various methods to create forall and exists goals. See:

for details.

Auto Trait Implementations§

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impl<'i, I> Freeze for GoalBuilder<'i, I>

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impl<'i, I> !RefUnwindSafe for GoalBuilder<'i, I>

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impl<'i, I> !Send for GoalBuilder<'i, I>

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impl<'i, I> !Sync for GoalBuilder<'i, I>

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impl<'i, I> Unpin for GoalBuilder<'i, I>

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impl<'i, I> !UnwindSafe for GoalBuilder<'i, I>

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impl<T> BorrowMut<T> for T
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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 as HasInterner>::Interner) -> U
where Self: CastTo<U>, U: HasInterner,

Cast a value to type U using CastTo.
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Returns the argument unchanged.

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

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