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use std::ops::{Add, Sub, Neg, Mul};
use abomonation::Abomonation;
use ::Data;
pub trait Diff : Add<Self, Output=Self> + Sub<Self, Output=Self> + Neg<Output=Self> + ::std::marker::Sized + Data + Copy {
fn is_zero(&self) -> bool;
fn zero() -> Self;
}
impl Diff for isize {
#[inline(always)] fn is_zero(&self) -> bool { *self == 0 }
#[inline(always)] fn zero() -> Self { 0 }
}
impl Diff for i64 {
#[inline(always)] fn is_zero(&self) -> bool { *self == 0 }
#[inline(always)] fn zero() -> Self { 0 }
}
impl Diff for i32 {
#[inline(always)] fn is_zero(&self) -> bool { *self == 0 }
#[inline(always)] fn zero() -> Self { 0 }
}
#[derive(Copy, Ord, PartialOrd, Eq, PartialEq, Debug, Clone)]
pub struct DiffPair<R1: Diff, R2: Diff> {
pub element1: R1,
pub element2: R2,
}
impl<R1: Diff, R2: Diff> DiffPair<R1, R2> {
#[inline(always)] pub fn new(elt1: R1, elt2: R2) -> Self {
DiffPair {
element1: elt1,
element2: elt2,
}
}
}
impl<R1: Diff, R2: Diff> Diff for DiffPair<R1, R2> {
#[inline(always)] fn is_zero(&self) -> bool { self.element1.is_zero() && self.element2.is_zero() }
#[inline(always)] fn zero() -> Self { DiffPair { element1: R1::zero(), element2: R2::zero() } }
}
impl<R1: Diff, R2: Diff> Add<DiffPair<R1, R2>> for DiffPair<R1, R2> {
type Output = Self;
#[inline(always)] fn add(self, rhs: Self) -> Self {
DiffPair {
element1: self.element1 + rhs.element1,
element2: self.element2 + rhs.element2,
}
}
}
impl<R1: Diff, R2: Diff> Sub<DiffPair<R1, R2>> for DiffPair<R1, R2> {
type Output = DiffPair<R1, R2>;
#[inline(always)] fn sub(self, rhs: Self) -> Self {
DiffPair {
element1: self.element1 - rhs.element1,
element2: self.element2 - rhs.element2,
}
}
}
impl<R1: Diff, R2: Diff> Neg for DiffPair<R1, R2> {
type Output = Self;
#[inline(always)] fn neg(self) -> Self {
DiffPair {
element1: -self.element1,
element2: -self.element2,
}
}
}
impl<T: Copy, R1: Diff+Mul<T>, R2: Diff+Mul<T>> Mul<T> for DiffPair<R1,R2>
where <R1 as Mul<T>>::Output: Diff, <R2 as Mul<T>>::Output: Diff {
type Output = DiffPair<<R1 as Mul<T>>::Output, <R2 as Mul<T>>::Output>;
fn mul(self, other: T) -> Self::Output {
DiffPair::new(
self.element1 * other,
self.element2 * other,
)
}
}
impl<R1: Diff, R2: Diff> Abomonation for DiffPair<R1, R2> { }