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#[macro_export] macro_rules! units { ($($i: ident), +) => { #[derive(Debug, PartialEq, PartialOrd, Ord, Clone, Copy, Eq)] #[allow(non_camel_case_types)] pub enum Units { $( $i, )+ } impl unitary::Measurement for Units {} }; } #[derive(Debug, Clone)] pub struct Qty<T: Measurement>(pub f64, pub Vec<(T, f64)>); #[macro_export] macro_rules! qty { ($i: expr; $t: ident) => { unitary::Qty($i, vec![(Units::$t, 1.0)]); }; } use std::fmt::{self, Debug}; pub trait Measurement: PartialEq + Ord + Copy + Debug + Eq {} use std::ops::{Add, Div, Mul, Sub}; impl<T: Measurement> Div<Qty<T>> for Qty<T> { type Output = Qty<T>; fn div(self, rhs: Qty<T>) -> Qty<T> { let mut num = self.1; let mut denom = rhs.1.into_iter().map(|(x, y)| (x, -y)).collect(); num.append(&mut denom); num.sort_by_key(|a| a.0); let num = get_units(&num); Qty(self.0 / rhs.0, num) } } impl<T: Measurement> Div<f64> for Qty<T> { type Output = Qty<T>; fn div(self, rhs: f64) -> Qty<T> { Qty(self.0 / rhs, self.1) } } impl<T: Measurement> Mul<Qty<T>> for Qty<T> { type Output = Qty<T>; fn mul(self, rhs: Qty<T>) -> Qty<T> { let mut num = self.1; let mut denom = rhs.1; num.append(&mut denom); num.sort_by_key(|a| a.0); let num = get_units(&num); Qty(self.0 * rhs.0, num) } } impl<T: Measurement> Mul<f64> for Qty<T> { type Output = Qty<T>; fn mul(self, rhs: f64) -> Qty<T> { Qty(self.0 * rhs, self.1) } } impl<T: Measurement> Add<Qty<T>> for Qty<T> { type Output = Qty<T>; fn add(self, rhs: Qty<T>) -> Qty<T> { if self.1 == rhs.1 { Qty(self.0 + rhs.0, self.1) } else { panic!("Differing Units") } } } impl<T: Measurement> Sub<Qty<T>> for Qty<T> { type Output = Qty<T>; fn sub(self, rhs: Qty<T>) -> Qty<T> { if self.1 == rhs.1 { Qty(self.0 - rhs.0, self.1) } else { panic!("Differing Units") } } } impl<T: Measurement> Into<f64> for Qty<T> { fn into(self) -> f64 { if self.1 == [] { self.0 } else { panic!("Cannot unwrap non-zero units") } } } use std::f64; impl<T: Measurement> fmt::Display for Qty<T> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!( f, "{} {}", self.0, self.1 .clone() .into_iter() .map(|(unit, coef)| if (coef - 1.0).abs() < f64::EPSILON { format!("⋅{:?}", unit) } else { format!("⋅({:?}^{})", unit, coef) }) .collect::<String>() ) } } fn get_units<T: Measurement>(data: &[(T, f64)]) -> Vec<(T, f64)> { let mut single = data.to_owned(); single.dedup_by_key(|a| a.0); let mut new = Vec::new(); for &(t, _v) in &single { let mut acc = 0.0; for &(d, v) in data { if d == t { acc += v; } } if acc != 0.0 { new.push((t, acc)); } } new } type Pair<T> = (Vec<(T, f64)>, (T, f64)); fn get_units_or_alias<T: Measurement>(data: Vec<(T, f64)>, aliases: &[Pair<T>]) -> Vec<(T, f64)> { for &(ref i, ref j) in aliases { if &data == i { return vec![*j]; } } data } impl<T: Measurement> Qty<T> { pub fn powf(self, rhs: f64) -> Qty<T> { Qty( self.0.powf(rhs), self.1 .into_iter() .map(|(x, y)| { let c = y < 1.0; let mut a = y.abs().powf(rhs); if c { a *= -1.0 } (x, a) }) .collect(), ) } pub fn update(&mut self, aliases: &[Pair<T>]) { self.1 = get_units_or_alias(self.1.clone(), aliases) } }