Squashed 'vendor/ruvector/' content from commit b64c2172

git-subtree-dir: vendor/ruvector
git-subtree-split: b64c21726f2bb37286d9ee36a7869fef60cc6900

crates/ruvector-core/src/index.rs

@@ -0,0 +1,36 @@
+//! Index structures for efficient vector search
+
+pub mod flat;
+#[cfg(feature = "hnsw")]
+pub mod hnsw;
+
+use crate::error::Result;
+use crate::types::{SearchResult, VectorId};
+
+/// Trait for vector index implementations
+pub trait VectorIndex: Send + Sync {
+    /// Add a vector to the index
+    fn add(&mut self, id: VectorId, vector: Vec<f32>) -> Result<()>;
+
+    /// Add multiple vectors in batch
+    fn add_batch(&mut self, entries: Vec<(VectorId, Vec<f32>)>) -> Result<()> {
+        for (id, vector) in entries {
+            self.add(id, vector)?;
+        }
+        Ok(())
+    }
+
+    /// Search for k nearest neighbors
+    fn search(&self, query: &[f32], k: usize) -> Result<Vec<SearchResult>>;
+
+    /// Remove a vector from the index
+    fn remove(&mut self, id: &VectorId) -> Result<bool>;
+
+    /// Get the number of vectors in the index
+    fn len(&self) -> usize;
+
+    /// Check if the index is empty
+    fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+}