Struct gadgets::is_zero::IsZeroChip

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pub struct IsZeroChip<F> { /* private fields */ }
Expand description

Wrapper around IsZeroConfig for which [Chip] is implemented.

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impl<F: Field> IsZeroChip<F>

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pub fn configure( meta: &mut ConstraintSystem<F>, q_enable: impl FnOnce(&mut VirtualCells<'_, F>) -> Expression<F>, value: impl FnOnce(&mut VirtualCells<'_, F>) -> Expression<F>, value_inv: Column<Advice> ) -> IsZeroConfig<F>

Sets up the configuration of the chip by creating the required columns and defining the constraints that take part when using is_zero gate.

Truth table of iz_zero gate: +––+—––+———–+———————–+———————————+———————————––+ | ok | value | value_inv | 1 - value ⋅ value_inv | value ⋅ (1 - value ⋅ value_inv) | value_inv ⋅ (1 - value ⋅ value_inv) | +––+—––+———–+———————–+———————————+———————————––+ | V | 0 | 0 | 1 | 0 | 0 | | | 0 | x | 1 | 0 | x | | | x | 0 | 1 | x | 0 | | V | x | 1/x | 0 | 0 | 0 | | | x | y | 1 - xy | x(1 - xy) | y(1 - xy) | +––+—––+———–+———————–+———————————+———————————––+

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pub fn construct(config: IsZeroConfig<F>) -> Self

Given an IsZeroConfig, construct the chip.

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pub fn annotate_columns_in_region( &self, region: &mut Region<'_, F>, prefix: &str )

Annotates columns of this gadget embedded within a circuit region.

Trait Implementations§

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impl<F: Field> Chip<F> for IsZeroChip<F>

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type Config = IsZeroConfig<F>

A type that holds the configuration for this chip, and any other state it may need during circuit synthesis, that can be derived during Circuit::configure.
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type Loaded = ()

A type that holds any general chip state that needs to be loaded at the start of Circuit::synthesize. This might simply be () for some chips.
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fn config(&self) -> &Self::Config

The chip holds its own configuration.
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fn loaded(&self) -> &Self::Loaded

Provides access to general chip state loaded at the beginning of circuit synthesis. Read more
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impl<F: Clone> Clone for IsZeroChip<F>

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fn clone(&self) -> IsZeroChip<F>

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<F: Debug> Debug for IsZeroChip<F>

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

Formats the value using the given formatter. Read more
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impl<F: Field> IsZeroInstruction<F> for IsZeroChip<F>

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fn assign( &self, region: &mut Region<'_, F>, offset: usize, value: Value<F> ) -> Result<(), Error>

Given a value to be checked if it is zero: Read more

Auto Trait Implementations§

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impl<F> RefUnwindSafe for IsZeroChip<F>
where F: RefUnwindSafe,

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impl<F> Send for IsZeroChip<F>
where F: Send,

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impl<F> Sync for IsZeroChip<F>
where F: Sync,

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impl<F> Unpin for IsZeroChip<F>
where F: Unpin,

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impl<F> UnwindSafe for IsZeroChip<F>
where F: UnwindSafe,

Blanket Implementations§

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

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