Struct halo2_proofs::plonk::Constraints

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pub struct Constraints<F, C, Iter>
where F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>,
{ /* private fields */ }
Expand description

A set of polynomial constraints with a common selector.

use halo2_middleware::poly::Rotation;
use halo2curves::pasta::Fp;

let a = meta.advice_column();
let b = meta.advice_column();
let c = meta.advice_column();
let s = meta.selector();

meta.create_gate("foo", |meta| {
    let next = meta.query_advice(a, Rotation::next());
    let a = meta.query_advice(a, Rotation::cur());
    let b = meta.query_advice(b, Rotation::cur());
    let c = meta.query_advice(c, Rotation::cur());
    let s_ternary = meta.query_selector(s);

    let one_minus_a = Expression::Constant(Fp::one()) - a.clone();

    Constraints::with_selector(
        s_ternary,
        std::array::IntoIter::new([
            ("a is boolean", a.clone() * one_minus_a.clone()),
            ("next == a ? b : c", next - (a * b + one_minus_a * c)),
        ]),
    )
});

Note that the use of std::array::IntoIter::new is only necessary if you need to support Rust 1.51 or 1.52. If your minimum supported Rust version is 1.53 or greater, you can pass an array directly.

Implementations§

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impl<F, C, Iter> Constraints<F, C, Iter>
where F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>,

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pub fn with_selector( selector: Expression<F>, constraints: Iter ) -> Constraints<F, C, Iter>

Constructs a set of constraints that are controlled by the given selector.

Each constraint c in iterator will be converted into the constraint selector * c.

Trait Implementations§

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impl<F, C, Iter> Debug for Constraints<F, C, Iter>
where F: Debug + Field, C: Debug + Into<Constraint<F>>, Iter: Debug + IntoIterator<Item = C>,

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

Formats the value using the given formatter. Read more
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impl<F, C, Iter> IntoIterator for Constraints<F, C, Iter>
where F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>,

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type Item = Constraint<F>

The type of the elements being iterated over.
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type IntoIter = Map<Zip<Repeat<Expression<F>>, <Iter as IntoIterator>::IntoIter>, fn(_: (Expression<F>, C)) -> Constraint<F>>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <Constraints<F, C, Iter> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more

Auto Trait Implementations§

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impl<F, C, Iter> Freeze for Constraints<F, C, Iter>
where Iter: Freeze, F: Freeze,

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impl<F, C, Iter> RefUnwindSafe for Constraints<F, C, Iter>
where Iter: RefUnwindSafe, F: RefUnwindSafe,

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impl<F, C, Iter> Send for Constraints<F, C, Iter>
where Iter: Send,

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impl<F, C, Iter> Sync for Constraints<F, C, Iter>
where Iter: Sync,

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impl<F, C, Iter> Unpin for Constraints<F, C, Iter>
where Iter: Unpin, F: Unpin,

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impl<F, C, Iter> UnwindSafe for Constraints<F, C, Iter>
where Iter: UnwindSafe, F: UnwindSafe,

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where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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