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impl<F: FieldExt> {Neg, Sub} for Expression<F>

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This commit is contained in:
Jack Grigg 2021-01-29 00:45:48 +00:00
parent f566bf7fe0
commit db0477a606
1 changed files with 19 additions and 2 deletions
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21
src/plonk/circuit.rs
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@ -1,10 +1,13 @@
use core::cmp::max; use core::cmp::max;
use core::ops::{Add, Mul}; use core::ops::{Add, Mul};
use ff::Field; use ff::Field;
use std::convert::TryFrom; use std::{
convert::TryFrom,
ops::{Neg, Sub},
};
use super::{lookup, permutation, Error}; use super::{lookup, permutation, Error};
use crate::poly::Rotation; use crate::{arithmetic::FieldExt, poly::Rotation};
/// A column type /// A column type
pub trait ColumnType: 'static + Sized {} pub trait ColumnType: 'static + Sized {}
@ -316,6 +319,13 @@ impl<F: Field> Expression<F> {
} }
} }
impl<F: FieldExt> Neg for Expression<F> {
type Output = Expression<F>;
fn neg(self) -> Self::Output {
Expression::Scaled(Box::new(self), -F::one())
}
}
impl<F> Add for Expression<F> { impl<F> Add for Expression<F> {
type Output = Expression<F>; type Output = Expression<F>;
fn add(self, rhs: Expression<F>) -> Expression<F> { fn add(self, rhs: Expression<F>) -> Expression<F> {
@ -323,6 +333,13 @@ impl<F> Add for Expression<F> {
} }
} }
impl<F: FieldExt> Sub for Expression<F> {
type Output = Expression<F>;
fn sub(self, rhs: Expression<F>) -> Expression<F> {
Expression::Sum(Box::new(self), Box::new(-rhs))
}
}
impl<F> Mul for Expression<F> { impl<F> Mul for Expression<F> {
type Output = Expression<F>; type Output = Expression<F>;
fn mul(self, rhs: Expression<F>) -> Expression<F> { fn mul(self, rhs: Expression<F>) -> Expression<F> {