Struct halo2_proofs::plonk::Constraints
source · [−]pub struct Constraints<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_proofs::{pasta::Fp, plonk::{Constraints, Expression}, poly::Rotation};
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
sourceimpl<F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>> Constraints<F, C, Iter>
impl<F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>> Constraints<F, C, Iter>
sourcepub fn with_selector(selector: Expression<F>, constraints: Iter) -> Self
pub fn with_selector(selector: Expression<F>, constraints: Iter) -> Self
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
sourceimpl<F: Debug + Field, C: Debug + Into<Constraint<F>>, Iter: Debug + IntoIterator<Item = C>> Debug for Constraints<F, C, Iter>
impl<F: Debug + Field, C: Debug + Into<Constraint<F>>, Iter: Debug + IntoIterator<Item = C>> Debug for Constraints<F, C, Iter>
sourceimpl<F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>> IntoIterator for Constraints<F, C, Iter>
impl<F: Field, C: Into<Constraint<F>>, Iter: IntoIterator<Item = C>> IntoIterator for Constraints<F, C, Iter>
type Item = Constraint<F>
type Item = Constraint<F>
The type of the elements being iterated over.
type IntoIter = Map<Zip<Repeat<Expression<F>>, <Iter as IntoIterator>::IntoIter>, fn((Expression<F>, C)) -> Constraint<F>>
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?
Auto Trait Implementations
impl<F, C, Iter> RefUnwindSafe for Constraints<F, C, Iter> where
F: RefUnwindSafe,
Iter: RefUnwindSafe,
impl<F, C, Iter> Send for Constraints<F, C, Iter> where
Iter: Send,
impl<F, C, Iter> Sync for Constraints<F, C, Iter> where
Iter: Sync,
impl<F, C, Iter> Unpin for Constraints<F, C, Iter> where
F: Unpin,
Iter: Unpin,
impl<F, C, Iter> UnwindSafe for Constraints<F, C, Iter> where
F: UnwindSafe,
Iter: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
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impl<T> FmtForward for T
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Self: Binary,
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Self: Binary,
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Self: Display,
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Self: Display,
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