fix: floating point arithmetic is shaky
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https://floating-point-gui.de/
This commit is contained in:
Aravinth Manivannan 2023-08-17 02:20:27 +05:30
parent b29e56bc5c
commit 7fff3aaaaf
Signed by: realaravinth
GPG key ID: AD9F0F08E855ED88
3 changed files with 530 additions and 128 deletions

416
Cargo.lock generated
View file

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@ -19,25 +150,295 @@ dependencies = [
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View file

@ -12,4 +12,6 @@ edition = "2021"
#build = "build.rs"
[dependencies]
rust_decimal = "1.31.0"
rust_decimal_macros = "1.31.0"
uuid = { version = "1.4.1", features = ["v4", "serde"] }

View file

@ -17,18 +17,16 @@
use std::collections::HashMap;
use std::rc::Rc;
use rust_decimal::prelude::*;
use rust_decimal_macros::dec;
use uuid::Uuid;
pub trait Purchasable {
fn cost(&self) -> f64;
fn cost(&self) -> Decimal;
fn name(&self) -> &str;
fn paid_by(&self) -> Rc<dyn Actor>;
}
pub fn money_owned(splits: &[Split]) {
for split in splits.iter() {}
}
#[derive(Clone)]
pub struct Split {
purchase: Rc<dyn Purchasable>,
@ -36,32 +34,63 @@ pub struct Split {
parties: Vec<Rc<dyn Actor>>,
}
//#[derive(Clone)]
//pub struct Split {
// shares: ShareHashMap,
// paid_by: Rc<dyn Actor>,
//}
impl Split {
pub fn new(purchase: Rc<dyn Purchasable>, split_strategy: SplitStrategy, parties: Vec<Rc<dyn Actor>>) -> Self {
pub fn new(
purchase: Rc<dyn Purchasable>,
split_strategy: SplitStrategy,
parties: Vec<Rc<dyn Actor>>,
) -> Self {
Self {
split_strategy, parties, purchase
split_strategy,
parties,
purchase,
}
}
// pub fn iter(&self) -> SplitIter {
// let iter = self.shares.iter();
// let paid_by = self.paid_by;
// SplitIter { iter, paid_by}
// }
//
// pub fn insert(&mut self, actor: Rc<dyn Actor>, amount: f64) {
// let name = actor.name().to_owned();
// self.shares.insert(name, (actor, amount));
// }
pub fn money_owed(&self) -> ShareHashMap {
match &self.split_strategy {
SplitStrategy::Unequal(shares) => {
let mut s = shares.clone();
let payer = self.purchase.paid_by();
if let Some((_, money)) = s.get_mut(payer.name()) {
*money = dec!(0.0);
}
s
}
SplitStrategy::Equal => {
let mut shares = ShareHashMap::default();
let cost = self.purchase.cost();
let total_parties = Decimal::new(self.parties.len() as i64, 0);
for actor in self.parties.iter() {
if *actor == self.purchase.paid_by() {
shares.insert(actor.name().to_owned(), (actor.clone(), dec!(0.00)));
} else {
shares.insert(
actor.name().to_owned(),
(actor.clone(), cost / total_parties),
);
}
}
pub fn get(&mut self, actor: Rc<dyn Actor>) -> Option<f64> {
shares
}
SplitStrategy::Shares(c) => {
let mut shares = ShareHashMap::default();
let cost = self.purchase.cost();
for (actor_name, (actor, share)) in c.iter() {
//if actor.name() == split.purchase.paid_by().name() {
if *actor == self.purchase.paid_by() {
shares.insert(actor_name.clone(), (actor.clone(), dec!(0.00)));
} else {
shares.insert(actor_name.clone(), (actor.clone(), cost * share));
}
}
shares
}
}
}
pub fn get(&mut self, actor: Rc<dyn Actor>) -> Option<Decimal> {
unimplemented!();
// if let Some((_actor, cost)) = self.shares.get(actor.name()) {
// Some(*cost)
@ -69,35 +98,14 @@ impl Split {
// None
// }
}
}
//pub struct SplitIter<'a> {
// iter: std::collections::hash_map::Iter<'a, String, (Rc<dyn Actor>, f64)>,
// paid_by: Rc<dyn Actor>,
//}
//
//impl<'a> Iterator for SplitIter<'a> {
// type Item = (Rc<dyn Actor>, f64);
//
// fn next(&mut self) -> Option<Self::Item> {
// if let Some((_, (actor, cost))) = self.iter.next() {
// Some((actor.clone(), *cost))
// } else {
// None
// }
// }
//}
impl Split {
pub fn validate(&self) -> bool {
self.split_strategy.validate(&self)
self.split_strategy.validate(self.purchase.as_ref())
}
}
// key is a string for getting Eq and PartialEq w object safety
pub type ShareHashMap = HashMap<String, (Rc<dyn Actor>, f64)>;
pub type ShareHashMap = HashMap<String, (Rc<dyn Actor>, Decimal)>;
/*
* SPLITTING STRATEGIES:
@ -113,74 +121,35 @@ pub enum SplitStrategy {
}
impl SplitStrategy {
pub fn validate(&self, split: &Split) -> bool {
fn validate(&self, purchase: &dyn Purchasable) -> bool {
match self {
SplitStrategy::Unequal(shares) => {
let mut total = 0.00;
let mut total = dec!(0.00);
for (_actor_str, (_actor_obj, share)) in shares.iter() {
total += share;
}
let cost = split.purchase.cost();
let cost = purchase.cost();
println!("Unequal sharing: expected {cost} got {total}");
total == cost
}
SplitStrategy::Shares(shares) => {
let mut total = 0.00;
let cost = split.purchase.cost();
let mut total_shares = 0.00;
let mut total = dec!(0.00);
let cost = purchase.cost();
let mut total_shares = dec!(0.00);
for (_actor_str, (_actor_obj, share)) in shares.iter() {
total_shares += share;
total += cost * share;
println!("Shares: {:?}, total: {total_shares}", share);
}
println!("Unequal sharing: expected shares 1 got {total_shares}");
println!("Unequal sharing: expected {cost} got {total}");
total_shares == 1.00 && total == cost
total_shares == dec!(1.00) && total == cost
}
SplitStrategy::Equal => true,
}
}
pub fn money_owed(&self, split: &Split) -> ShareHashMap {
match self {
SplitStrategy::Unequal(shares) => {
let mut s = shares.clone();
let payer = split.purchase.paid_by();
if let Some((_,money)) = s.get_mut(payer.name()) {
*money = 0.0;
}
s
}
SplitStrategy::Equal => {
let mut shares = ShareHashMap::default();
let cost = split.purchase.cost();
for actor in split.parties.iter() {
if *actor == split.purchase.paid_by() {
shares.insert(actor.name().to_owned(), (actor.clone(), 0.00));
} else {
shares.insert(actor.name().to_owned(), (actor.clone(), cost / split.parties.len() as f64));
}
}
shares
}
SplitStrategy::Shares(c) => {
let mut shares = ShareHashMap::default();
let cost = split.purchase.cost();
for (actor_name,(actor, share)) in c.iter() {
//if actor.name() == split.purchase.paid_by().name() {
if *actor == split.purchase.paid_by() {
shares.insert(actor_name.clone(), (actor.clone(), 0.00));
} else {
shares.insert(actor_name.clone(), (actor.clone(), cost * share));
}
}
shares
}
}
}
}
pub trait Actor {
@ -209,7 +178,12 @@ impl Person {
let owes = Vec::default();
let spent = Vec::default();
Self { name, spent, owes, id}
Self {
name,
spent,
owes,
id,
}
}
}
@ -234,23 +208,22 @@ impl Actor for Person {
fn id(&self) -> &Uuid {
&self.id
}
}
pub struct Item {
cost: f64,
cost: Decimal,
name: String,
payer: Rc<dyn Actor>,
}
impl Item {
pub fn new(name: String, cost: f64, payer: Rc<dyn Actor>) -> Self {
pub fn new(name: String, cost: Decimal, payer: Rc<dyn Actor>) -> Self {
Self { cost, name, payer }
}
}
impl Purchasable for Item {
fn cost(&self) -> f64 {
fn cost(&self) -> Decimal {
self.cost
}
fn name(&self) -> &str {
@ -278,7 +251,7 @@ mod tests {
let person3: Rc<dyn Actor> = Rc::new(Person::new("person3".into(), Uuid::new_v4()));
let person4: Rc<dyn Actor> = Rc::new(Person::new("person4".into(), Uuid::new_v4()));
let item = Item::new("test item".into(), 240.00, person1.clone());
let item = Item::new("test item".into(), dec!(240.00), person1.clone());
let actors = vec![
person1.clone(),
person2.clone(),
@ -286,37 +259,39 @@ mod tests {
person4.clone(),
];
// equal split
let strategy = SplitStrategy::Equal;
let mut split = Split::new(Rc::new(item), strategy, actors);
assert!(split.split_strategy.validate(&split));
let dues = split.split_strategy.money_owed(&split);
assert!(split.validate());
let dues = split.money_owed();
for (_actor_name, (actor, due)) in dues.iter() {
if split.purchase.paid_by().name() == actor.name() {
assert_eq!(*due, 0.00);
assert_eq!(*due, dec!(0.00));
} else {
assert_eq!(*due, split.purchase.cost() / split.parties.len() as f64);
assert_eq!(
*due,
split.purchase.cost() / Decimal::new(split.parties.len() as i64, 0)
);
}
}
// share split
let mut shares = ShareHashMap::default();
shares.insert(person1.name().to_owned(), (person1.clone(), 0.3));
shares.insert(person2.name().to_owned(), (person2.clone(), 0.4));
shares.insert(person3.name().to_owned(), (person3.clone(), 0.2));
shares.insert(person4.name().to_owned(), (person4.clone(), 0.1));
shares.insert(person1.name().to_owned(), (person1.clone(), dec!(0.3)));
shares.insert(person2.name().to_owned(), (person2.clone(), dec!(0.4)));
shares.insert(person3.name().to_owned(), (person3.clone(), dec!(0.2)));
shares.insert(person4.name().to_owned(), (person4.clone(), dec!(0.1)));
let strategy = SplitStrategy::Shares(shares.clone());
split.split_strategy = strategy;
assert!(split.split_strategy.validate(&split));
assert!(split.validate());
let dues = split.split_strategy.money_owed(&split);
let dues = split.money_owed();
for (actor_name, (actor, due)) in dues.iter() {
println!("Testing for actor: {actor_name} with due: {due}");
if split.purchase.paid_by().name() == actor.name() {
assert_eq!(*due, 0.00);
assert_eq!(*due, dec!(0.00));
} else {
let (_, share) = shares.get(actor_name).unwrap();
assert_eq!(*due, split.purchase.cost() * *share);
@ -325,15 +300,24 @@ mod tests {
// Unequal split
let mut shares = ShareHashMap::default();
shares.insert(person1.name().to_owned(), (person1.clone(), 0.3 * split.purchase.cost()));
shares.insert(person2.name().to_owned(), (person2.clone(), 0.4 * split.purchase.cost()));
shares.insert(person3.name().to_owned(), (person3.clone(), 0.2 * split.purchase.cost()));
shares.insert(person4.name().to_owned(), (person4.clone(), 0.1 * split.purchase.cost()));
shares.insert(
person1.name().to_owned(),
(person1.clone(), dec!(0.3) * split.purchase.cost()),
);
shares.insert(
person2.name().to_owned(),
(person2.clone(), dec!(0.4) * split.purchase.cost()),
);
shares.insert(
person3.name().to_owned(),
(person3.clone(), dec!(0.2) * split.purchase.cost()),
);
shares.insert(
person4.name().to_owned(),
(person4.clone(), dec!(0.1) * split.purchase.cost()),
);
let strategy = SplitStrategy::Unequal(shares);
split.split_strategy = strategy;
assert!(split.split_strategy.validate(&split));
assert!(split.validate());
}
}