Trait Assignment

pub trait Assignment<F>
where
    F: Field,
{
    // Required methods
    fn enter_region<NR, N>(&mut self, name_fn: N)
       where NR: Into<String>,
             N: FnOnce() -> NR;
    fn exit_region(&mut self);
    fn enable_selector<A, AR>(
        &mut self,
        annotation: A,
        selector: &Selector,
        row: usize,
    ) -> Result<(), Error>
       where A: FnOnce() -> AR,
             AR: Into<String>;
    fn query_instance(
        &self,
        column: Column<Instance>,
        row: usize,
    ) -> Result<Value<F>, Error>;
    fn assign_advice<V, VR, A, AR>(
        &mut self,
        annotation: A,
        column: Column<Advice>,
        row: usize,
        to: V,
    ) -> Result<(), Error>
       where V: FnOnce() -> Value<VR>,
             VR: Into<Assigned<F>>,
             A: FnOnce() -> AR,
             AR: Into<String>;
    fn assign_fixed<V, VR, A, AR>(
        &mut self,
        annotation: A,
        column: Column<Fixed>,
        row: usize,
        to: V,
    ) -> Result<(), Error>
       where V: FnOnce() -> Value<VR>,
             VR: Into<Assigned<F>>,
             A: FnOnce() -> AR,
             AR: Into<String>;
    fn copy(
        &mut self,
        left_column: Column<Any>,
        left_row: usize,
        right_column: Column<Any>,
        right_row: usize,
    ) -> Result<(), Error>;
    fn fill_from_row(
        &mut self,
        column: Column<Fixed>,
        row: usize,
        to: Value<Assigned<F>>,
    ) -> Result<(), Error>;
    fn push_namespace<NR, N>(&mut self, name_fn: N)
       where NR: Into<String>,
             N: FnOnce() -> NR;
    fn pop_namespace(&mut self, gadget_name: Option<String>);
}

This trait allows a Circuit to direct some backend to assign a witness for a constraint system.

Required Methods

fn enter_region<NR, N>(&mut self, name_fn: N)

where NR: Into<String>, N: FnOnce() -> NR,

Creates a new region and enters into it.

Panics if we are currently in a region (if exit_region was not called).

Not intended for downstream consumption; use Layouter::assign_region instead.

fn exit_region(&mut self)

Exits the current region.

Panics if we are not currently in a region (if enter_region was not called).

Not intended for downstream consumption; use Layouter::assign_region instead.

fn enable_selector<A, AR>( &mut self, annotation: A, selector: &Selector, row: usize, ) -> Result<(), Error>

where A: FnOnce() -> AR, AR: Into<String>,

Enables a selector at the given row.

fn query_instance( &self, column: Column<Instance>, row: usize, ) -> Result<Value<F>, Error>

Queries the cell of an instance column at a particular absolute row.

Returns the cell’s value, if known.

fn assign_advice<V, VR, A, AR>( &mut self, annotation: A, column: Column<Advice>, row: usize, to: V, ) -> Result<(), Error>

where V: FnOnce() -> Value<VR>, VR: Into<Assigned<F>>, A: FnOnce() -> AR, AR: Into<String>,

Assign an advice column value (witness)

fn assign_fixed<V, VR, A, AR>( &mut self, annotation: A, column: Column<Fixed>, row: usize, to: V, ) -> Result<(), Error>

where V: FnOnce() -> Value<VR>, VR: Into<Assigned<F>>, A: FnOnce() -> AR, AR: Into<String>,

Assign a fixed value

fn copy( &mut self, left_column: Column<Any>, left_row: usize, right_column: Column<Any>, right_row: usize, ) -> Result<(), Error>

Assign two cells to have the same value

fn fill_from_row( &mut self, column: Column<Fixed>, row: usize, to: Value<Assigned<F>>, ) -> Result<(), Error>

Fills a fixed column starting from the given row with value to.

fn push_namespace<NR, N>(&mut self, name_fn: N)

where NR: Into<String>, N: FnOnce() -> NR,

Creates a new (sub)namespace and enters into it.

Not intended for downstream consumption; use Layouter::namespace instead.

fn pop_namespace(&mut self, gadget_name: Option<String>)

Exits out of the existing namespace.

Not intended for downstream consumption; use Layouter::namespace instead.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<F> Assignment<F> for MockProver<F>

where F: Field,