fix: floating point arithmetic is shaky

https://floating-point-gui.de/

Cargo.lock

@@ -2,12 +2,143 @@
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@@ -19,25 +150,295 @@ dependencies = [
  "wasi",
 ]
 
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+
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+
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@@ -48,8 +449,23 @@ dependencies = [
  "serde",
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+[[package]]
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+dependencies = [
+ "tap",
+]

Cargo.toml

@@ -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"] }

src/lib.rs

@@ -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 {
+    pub fn money_owed(&self) -> ShareHashMap {
-//        let iter = self.shares.iter();
+        match &self.split_strategy {
-//        let paid_by = self.paid_by;
+            SplitStrategy::Unequal(shares) => {
-//        SplitIter { iter,  paid_by}
+                let mut s = shares.clone();
-//    }
+                let payer = self.purchase.paid_by();
-//
+                if let Some((_, money)) = s.get_mut(payer.name()) {
-//    pub fn insert(&mut self, actor: Rc<dyn Actor>, amount: f64) {
+                    *money = dec!(0.0);
-//        let name = actor.name().to_owned();
+                }
-//        self.shares.insert(name, (actor, amount));
+                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 mut total = dec!(0.00);
-                let cost = split.purchase.cost();
+                let cost = purchase.cost();
-                let mut total_shares = 0.00;
+                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));
+        assert!(split.validate());
-        let dues = split.split_strategy.money_owed(&split);
+        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(person1.name().to_owned(), (person1.clone(), dec!(0.3)));
-        shares.insert(person2.name().to_owned(), (person2.clone(), 0.4));
+        shares.insert(person2.name().to_owned(), (person2.clone(), dec!(0.4)));
-        shares.insert(person3.name().to_owned(), (person3.clone(), 0.2));
+        shares.insert(person3.name().to_owned(), (person3.clone(), dec!(0.2)));
-        shares.insert(person4.name().to_owned(), (person4.clone(), 0.1));
+        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(
-        shares.insert(person2.name().to_owned(), (person2.clone(), 0.4 * split.purchase.cost()));
+            person1.name().to_owned(),
-        shares.insert(person3.name().to_owned(), (person3.clone(), 0.2 * split.purchase.cost()));
+            (person1.clone(), dec!(0.3) * split.purchase.cost()),
-        shares.insert(person4.name().to_owned(), (person4.clone(), 0.1 * 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());
-
-
     }
-
 }