README.md

@@ -1,9 +1,3 @@
 # pyority_queue
 
 Implementations of priority queues in Python using Rust bindings for speed.
-
-## Purpose
-
-I'm doing this to learn Rust, so don't judge me too hard lol.
-I've noted a few places where I'm unhappy with the implementation (mostly w.r.t. code duplication), but hopefully as I become more comfortable in Rust I can go back and fix those.
-Better to have a bad implementation now than a good implementation never is my view.

src/backing/containers/mod.rs

@@ -1,7 +1,5 @@
 mod pair;
 mod py_item;
-mod sift_result;
 
 pub use pair::Pair;
 pub use py_item::PyItem;
-pub use sift_result::{SiftError, SiftResult};

src/backing/containers/pair.rs

@@ -13,25 +13,11 @@ impl<D: Clone, P: PartialOrd + Clone> Pair<D, P> {
         Self { data, priority }
     }
 
-    /// Returns the internal data.
-    /// It might(?) be nicer to implement this using [`From`] or [`Into`], but I don't see a way to do that using generics.
+    /// Retrieves the internal data.
+    /// It would be nicer to implement this using [`From`] or [`Into`], but I don't see a way to do that using generics.
     pub fn data(self) -> D {
         self.data
     }
-
-    pub fn get_data(&self) -> &D {
-        &self.data
-    }
-
-    /// Retrieve the priority associated with the data
-    pub fn get_priority(&self) -> &P {
-        &self.priority
-    }
-
-    /// Update the priority associated with the data
-    pub fn set_priority(&mut self, priority: P) {
-        self.priority = priority
-    }
 }
 
 impl<D: Clone, P: PartialOrd + Clone> PartialOrd for Pair<D, P> {

src/backing/containers/py_item.rs

@@ -48,8 +48,6 @@ impl PartialEq for PyItem {
     }
 }
 
-impl Eq for PyItem {}
-
 impl Hash for PyItem {
     fn hash<H: Hasher>(&self, state: &mut H) {
         // TODO: Should warn or fail instead of defaulting to 0

src/backing/containers/sift_result.rs

@@ -1,26 +0,0 @@
-use std::fmt::{Display, Formatter, Result as fmtResult};
-
-/// Indicates why a sift failed
-#[derive(Debug, Clone)]
-pub struct SiftError {
-    /// The index that couldn't be sifted
-    index: usize,
-    /// The length of the array
-    len: usize,
-}
-
-impl SiftError {
-    /// Instantiates a `SiftError`
-    pub fn new(index: usize, len: usize) -> Self {
-        Self { index, len }
-    }
-}
-
-impl Display for SiftError {
-    fn fmt(&self, f: &mut Formatter) -> fmtResult {
-        write!(f, "Could not sift index {} of {}", self.index, self.len)
-    }
-}
-
-/// Whether a sift operation succeeded
-pub type SiftResult = Result<(), SiftError>;

src/backing/indexed/binary_heap.rs

@@ -1,194 +1,49 @@
 use std::{collections::HashMap, hash::Hash};
 
-use crate::backing::{
-    containers::{Pair, SiftError, SiftResult},
-    indexed::IndexedBacking,
-};
+use crate::backing::{containers::Pair, indexed::IndexedBacking};
 
-pub struct IndexedBinaryHeap<
-    D: Hash + Eq + Clone + Send + Sync,
-    P: PartialOrd + Clone + Send + Sync,
-> {
+pub struct IndexedBinaryHeap<D: Hash + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> {
     data: Vec<Pair<D, P>>,
     indices: HashMap<D, usize>,
 }
 
-impl<D: Hash + Eq + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync>
-    IndexedBinaryHeap<D, P>
-{
+impl<D: Hash + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> IndexedBinaryHeap<D, P> {
     pub fn new() -> Self {
         Self {
             data: Vec::new(),
             indices: HashMap::new(),
         }
     }
-
-    fn sift_up(&mut self, i: usize) -> SiftResult {
-        print!("{i}");
-        if i == 0 {
-            // Base case, at root so nothing to do
-            Ok(())
-        } else if let Some(child) = self.data.get(i).cloned() {
-            let parent_index = (i - 1) / 2;
-            // Check if the heap property is violated
-            if child < self.data[parent_index] {
-                (self.data[i], self.data[parent_index]) =
-                    (self.data[parent_index].clone(), self.data[i].clone());
-                self.indices.insert(self.data[i].clone().data(), i).unwrap();
-                self.indices
-                    .insert(self.data[parent_index].clone().data(), parent_index)
-                    .unwrap();
-                self.sift_up(parent_index)
-            } else {
-                // Sift complete
-                Ok(())
-            }
-        } else {
-            // Tried to sift a non-existent index
-            Err(SiftError::new(i, self.data.len()))
-        }
 }
 
-    fn sift_down(&mut self, i: usize) -> SiftResult {
-        print!("{i}");
-        if i > self.data.len() {
-            // Tried to sift a non-existent index
-            Err(SiftError::new(i, self.data.len()))
-        } else {
-            if let Some(first_child) = self.data.get(i * 2 + 1).cloned() {
-                let smaller_child_index;
-                let smaller_child;
-
-                // Find the smallest child and its index
-                if let Some(second_child) = self.data.get(i * 2 + 2).cloned() {
-                    // Both children, use the smaller one
-                    if first_child < second_child {
-                        smaller_child = first_child;
-                        smaller_child_index = i * 2 + 1;
-                    } else {
-                        smaller_child = second_child;
-                        smaller_child_index = i * 2 + 2;
-                    }
-                } else {
-                    // Only one child, no choice
-                    smaller_child = first_child;
-                    smaller_child_index = i * 2 + 1;
-                }
-
-                if smaller_child < self.data[i] {
-                    // Swap parent with child
-                    self.data[smaller_child_index] = self.data[i].clone();
-                    self.indices
-                        .insert(
-                            self.data[smaller_child_index].clone().data(),
-                            smaller_child_index,
-                        )
-                        .unwrap();
-                    self.data[i] = smaller_child.clone();
-                    self.indices.insert(smaller_child.data(), i).unwrap();
-
-                    // Repeat process with child
-                    self.sift_down(smaller_child_index)
-                } else {
-                    // Heap property satisfied, we're done
-                    Ok(())
-                }
-            } else {
-                // Base case, no children so nothing to do
-                Ok(())
-            }
-        }
-    }
-
-    fn delete_pair(&mut self, i: usize) -> Option<Pair<D, P>> {
-        if i >= self.data.len() {
-            return None;
-        }
-        let pair = self.data[i].clone();
-        if i < self.data.len() - 1 {
-            self.data[i] = self.data.pop().unwrap();
-            if self.data[i] < pair {
-                self.sift_up(i).unwrap();
-            } else {
-                self.sift_down(i).unwrap();
-            }
-        } else {
-            self.data.pop().unwrap();
-        }
-        self.indices.remove(pair.get_data()).unwrap();
-        Some(pair)
-    }
-}
-
-impl<D: Hash + Eq + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> FromIterator<(D, P)>
+impl<D: Hash + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> FromIterator<(D, P)>
     for IndexedBinaryHeap<D, P>
 {
     fn from_iter<T: IntoIterator<Item = (D, P)>>(iter: T) -> Self {
-        let mut this = Self::new();
-        for (i, (data, priority)) in iter.into_iter().enumerate() {
-            if let Some(prev) = this.indices.insert(data.clone(), i) {
-                this.indices.insert(data.clone(), prev).unwrap();
-                this.data[prev] = Pair::new(data, priority);
-            } else {
-                this.data.push(Pair::new(data, priority));
-            }
-        }
-        for i in (0..=(this.data.len() / 2)).rev() {
-            this.sift_down(i).expect("Index error during heapify");
-        }
-        this
+        todo!()
     }
 }
 
-impl<D: Hash + Eq + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> IndexedBacking<D, P>
+impl<D: Hash + Clone + Send + Sync, P: PartialOrd + Clone + Send + Sync> IndexedBacking<D, P>
     for IndexedBinaryHeap<D, P>
 {
     fn len(&self) -> usize {
-        self.data.len()
+        todo!()
     }
 
     fn contains(&self, data: &D) -> bool {
-        self.indices.contains_key(data)
+        todo!()
     }
 
     fn set(&mut self, data: D, priority: P) {
-        if let Some(index) = self.indices.get(&data) {
-            let pair = self.data.get_mut(*index).unwrap();
-            let old_priority = pair.get_priority();
-            if priority < *old_priority {
-                pair.set_priority(priority);
-                self.sift_up(*index).unwrap();
-            } else {
-                pair.set_priority(priority);
-                self.sift_down(*index).unwrap();
-            }
-        } else {
-            let final_index = self.data.len();
-            if let Some(_) = self.indices.insert(data.clone(), final_index) {
-                panic!("Item was not consistently hashed")
-            }
-            self.data.push(Pair::new(data, priority));
-            self.sift_up(final_index).unwrap();
-        }
+        todo!()
     }
 
     fn remove(&mut self, data: D) -> Option<P> {
-        if let Some(index) = self.indices.get(&data) {
-            if let Some(pair) = self.delete_pair(*index) {
-                Some(pair.get_priority().clone())
-            } else {
-                None
-            }
-        } else {
-            None
-        }
+        todo!()
     }
 
     fn pop(&mut self) -> Option<D> {
-        if let Some(pair) = self.delete_pair(0) {
-            Some(pair.data())
-        } else {
-            None
-        }
+        todo!()
     }
 }

src/backing/pure/binary_heap.rs

@@ -1,7 +1,32 @@
-use crate::backing::containers::{SiftError, SiftResult};
+use std::fmt;
 
 use super::PureBacking;
 
+/// Indicates why a sift failed
+#[derive(Debug, Clone)]
+struct SiftError {
+    /// The index that couldn't be sifted
+    index: usize,
+    /// The length of the array
+    len: usize,
+}
+
+impl SiftError {
+    /// Instantiates a `SiftError`
+    fn new(index: usize, len: usize) -> Self {
+        Self { index, len }
+    }
+}
+
+impl fmt::Display for SiftError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Could not sift index {} of {}", self.index, self.len)
+    }
+}
+
+/// Whether a sift operation succeeded
+type SiftResult = Result<(), SiftError>;
+
 /// A binary min-heap backed by an array
 #[derive(Debug)]
 pub struct BinaryHeap<T: PartialOrd + Clone + Send + Sync> {