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API_COMPLETION_STATUS.md

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BPlusTreeMap API Completion Status

Current Implementation Status

✅ Implemented Core Functions

Construction:

  • new(capacity: usize) ✓
  • Default::default() ✓

Access:

  • get(&self, key: &K) ✓
  • get_mut(&mut self, key: &K) ✓
  • contains_key(&self, key: &K) ✓
  • get_or_default(&self, key: &K, default: &V) ✓ (custom)
  • get_item(&self, key: &K) ✓ (custom error handling)

Modification:

  • insert(&mut self, key: K, value: V) ✓
  • remove(&mut self, key: &K) ✓
  • clear(&mut self) ✓

Size & State:

  • len(&self) ✓
  • is_empty(&self) ✓
  • is_leaf_root(&self) ✓ (custom)
  • leaf_count(&self) ✓ (custom)

Iteration:

  • keys(&self) ✓
  • values(&self) ✓
  • items(&self) ✓ (equivalent to iter())
  • items_fast(&self) ✓ (custom optimized)
  • range<R>(&self, range: R) ✓
  • items_range(&self, start: &K, end: &K) ✓ (custom)

Range Access:

  • first(&self) ✓
  • last(&self) ✓

Custom Extensions:

  • try_get(&self, key: &K) ✓ (error handling)
  • try_insert(&mut self, key: K, value: V) ✓ (error handling)
  • try_remove(&mut self, key: &K) ✓ (error handling)
  • batch_insert(&mut self, items: Vec<(K, V)>) ✓ (bulk operations)
  • get_many(&self, keys: &[K]) ✓ (bulk operations)
  • validate_for_operation(&self, operation: &str) ✓ (debugging)

❌ Missing Standard BTreeMap Functions

High Priority (Core Functionality)

  1. entry(&mut self, key: K) -> Entry<K, V>

    • Essential for efficient insert-or-update patterns
    • Returns Entry enum with Occupied and Vacant variants
    • Status: MISSING

  2. append(&mut self, other: &mut BTreeMap<K, V>)

    • Moves all elements from another map
    • Status: MISSING

  3. split_off(&mut self, key: &K) -> BTreeMap<K, V>

    • Splits map at key, returns new map with keys >= split key
    • Status: MISSING

Medium Priority (Convenience & Performance)

  1. pop_first(&mut self) -> Option<(K, V)>

    • Removes and returns first key-value pair
    • Status: MISSING

  2. pop_last(&mut self) -> Option<(K, V)>

    • Removes and returns last key-value pair
    • Status: MISSING

  3. retain<F>(&mut self, f: F) where F: FnMut(&K, &mut V) -> bool

    • Retains only elements for which predicate returns true
    • Status: MISSING

  4. values_mut(&mut self) -> ValuesMut<K, V>

    • Mutable iterator over values
    • Status: MISSING

  5. iter_mut(&mut self) -> IterMut<K, V>

    • Mutable iterator over key-value pairs
    • Status: MISSING

  6. range_mut<R>(&mut self, range: R) -> RangeMut<K, V>

    • Mutable range iterator
    • Status: MISSING

Lower Priority (Consuming Iterators)

  1. into_keys(self) -> IntoKeys<K, V>

    • Consuming iterator over keys
    • Status: MISSING

  2. into_values(self) -> IntoValues<K, V>

    • Consuming iterator over values
    • Status: MISSING

  3. into_iter(self) -> IntoIter<K, V>

    • Consuming iterator over key-value pairs
    • Status: MISSING

Specialized/Unstable (Optional)

  1. first_key_value(&self) -> Option<(&K, &V)>

    • We have first() which is equivalent
    • Status: EQUIVALENT EXISTS

  2. last_key_value(&self) -> Option<(&K, &V)>

    • We have last() which is equivalent
    • Status: EQUIVALENT EXISTS

  3. first_entry(&mut self) -> Option<OccupiedEntry<K, V>>

    • Requires Entry API implementation
    • Status: MISSING (depends on Entry)

  4. last_entry(&mut self) -> Option<OccupiedEntry<K, V>>

    • Requires Entry API implementation
    • Status: MISSING (depends on Entry)

Implementation Priority Order

Phase 1: Essential Missing Functions

  1. Entry API (entry(), Entry enum, OccupiedEntry, VacantEntry)
  2. append() - Map merging functionality
  3. split_off() - Map splitting functionality

Phase 2: Convenience Functions

  1. pop_first() and pop_last()
  2. retain() - In-place filtering
  3. Mutable iterators (values_mut(), iter_mut(), range_mut())

Phase 3: Consuming Iterators

  1. into_keys(), into_values(), into_iter()

Compatibility Assessment

Current Compatibility: ~75% of standard BTreeMap API

  • ✅ All basic operations (get, insert, remove, clear)
  • ✅ All read-only iteration
  • ✅ Range queries
  • ✅ Size and state queries
  • ❌ Entry API (major gap)
  • ❌ Map manipulation (append, split_off)
  • ❌ Mutable iteration
  • ❌ Consuming iteration

Target: 95%+ compatibility with standard BTreeMap API