Struct halo2_proofs::circuit::Region

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pub struct Region<'r, F>
where F: Field,
{ /* private fields */ }
Expand description

A region of the circuit in which a Chip can assign cells.

Inside a region, the chip may freely use relative offsets; the Layouter will treat these assignments as a single “region” within the circuit.

The Layouter is allowed to optimise between regions as it sees fit. Chips must use Region::constrain_equal to copy in variables assigned in other regions.

TODO: It would be great if we could constrain the columns in these types to be “logical” columns that are guaranteed to correspond to the chip (and have come from Chip::Config).

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impl<'r, F> Region<'r, F>
where F: Field,

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pub fn enable_selector<A, AR>( &mut self, annotation: A, selector: &Selector, offset: usize ) -> Result<(), Error>
where A: Fn() -> AR, AR: Into<String>,

Enables a selector at the given offset.

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pub fn name_column<A, AR, T>(&mut self, annotation: A, column: T)
where A: Fn() -> AR, AR: Into<String>, T: Into<Column<Any>>,

Allows the circuit implementor to name/annotate a Column within a Region context.

This is useful in order to improve the amount of information that prover.verify() and prover.assert_satisfied() can provide.

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pub fn assign_advice<'v, V, VR, A, AR>( &'v mut self, annotation: A, column: Column<Advice>, offset: usize, to: V ) -> Result<AssignedCell<VR, F>, Error>
where V: FnMut() -> Value<VR> + 'v, Assigned<F>: for<'vr> From<&'vr VR>, A: Fn() -> AR, AR: Into<String>,

Assign an advice column value (witness).

Even though to has FnMut bounds, it is guaranteed to be called at most once.

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pub fn assign_advice_from_constant<VR, A, AR>( &mut self, annotation: A, column: Column<Advice>, offset: usize, constant: VR ) -> Result<AssignedCell<VR, F>, Error>
where Assigned<F>: for<'vr> From<&'vr VR>, A: Fn() -> AR, AR: Into<String>,

Assigns a constant value to the column advice at offset within this region.

The constant value will be assigned to a cell within one of the fixed columns configured via ConstraintSystem::enable_constant.

Returns the advice cell.

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pub fn assign_advice_from_instance<A, AR>( &mut self, annotation: A, instance: Column<Instance>, row: usize, advice: Column<Advice>, offset: usize ) -> Result<AssignedCell<F, F>, Error>
where A: Fn() -> AR, AR: Into<String>,

Assign the value of the instance column’s cell at absolute location row to the column advice at offset within this region.

Returns the advice cell, and its value if known.

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pub fn instance_value( &mut self, instance: Column<Instance>, row: usize ) -> Result<Value<F>, Error>

Returns the value of the instance column’s cell at absolute location row.

This method is only provided for convenience; it does not create any constraints. Callers still need to use Self::assign_advice_from_instance to constrain the instance values in their circuit.

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pub fn assign_fixed<'v, V, VR, A, AR>( &'v mut self, annotation: A, column: Column<Fixed>, offset: usize, to: V ) -> Result<AssignedCell<VR, F>, Error>
where V: FnMut() -> Value<VR> + 'v, Assigned<F>: for<'vr> From<&'vr VR>, A: Fn() -> AR, AR: Into<String>,

Assign a fixed value.

Even though to has FnMut bounds, it is guaranteed to be called at most once.

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pub fn constrain_constant<VR>( &mut self, cell: Cell, constant: VR ) -> Result<(), Error>
where VR: Into<Assigned<F>>,

Constrains a cell to have a constant value.

Returns an error if the cell is in a column where equality has not been enabled.

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pub fn constrain_equal(&mut self, left: Cell, right: Cell) -> Result<(), Error>

Constrains two cells to have the same value.

Returns an error if either of the cells are in columns where equality has not been enabled.

Trait Implementations§

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impl<'r, F> Debug for Region<'r, F>
where F: Debug + Field,

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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<'r, F> From<&'r mut dyn RegionLayouter<F>> for Region<'r, F>
where F: Field,

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fn from(region: &'r mut dyn RegionLayouter<F>) -> Region<'r, F>

Converts to this type from the input type.

Auto Trait Implementations§

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impl<'r, F> Freeze for Region<'r, F>

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impl<'r, F> !RefUnwindSafe for Region<'r, F>

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impl<'r, F> Send for Region<'r, F>

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impl<'r, F> Sync for Region<'r, F>

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impl<'r, F> Unpin for Region<'r, F>

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impl<'r, F> !UnwindSafe for Region<'r, F>

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