From 0bc4df6a1ab14ecf55d68cc86134d14b26eca6e5 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Thu, 28 May 2020 14:47:10 -0400
Subject: exhaustive: Implement an exhaustive search index

---
 src/lib.rs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index b1639d7..2f6504a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,6 +5,7 @@
 pub mod coords;
 pub mod distance;
 pub mod euclid;
+pub mod exhaustive;
 
 pub use coords::Coordinates;
 pub use distance::{Distance, Metric, Proximity};
@@ -303,6 +304,12 @@ pub trait ExactNeighbors<K: Proximity<V>, V = K>: NearestNeighbors<K, V> {}
 pub mod tests {
     use super::*;
 
+    use crate::exhaustive::ExhaustiveSearch;
+
+    use rand::prelude::*;
+
+    use std::iter::FromIterator;
+
     type Point = Euclidean<[f32; 3]>;
 
     /// Test a [NearestNeighbors] implementation.
@@ -313,6 +320,7 @@ pub mod tests {
     {
         test_empty(&from_iter);
         test_pythagorean(&from_iter);
+        test_random_points(&from_iter);
     }
 
     fn test_empty<T, F>(from_iter: &F)
@@ -385,4 +393,28 @@ pub mod tests {
             ]
         );
     }
+
+    fn test_random_points<T, F>(from_iter: &F)
+    where
+        T: NearestNeighbors<Point>,
+        F: Fn(Vec<Point>) -> T,
+    {
+        let mut points = Vec::new();
+        for _ in 0..256 {
+            points.push(Euclidean([random(), random(), random()]));
+        }
+
+        let index = from_iter(points.clone());
+        let eindex = ExhaustiveSearch::from_iter(points.clone());
+
+        let target = Euclidean([random(), random(), random()]);
+
+        assert_eq!(
+            index.k_nearest(&target, 3),
+            eindex.k_nearest(&target, 3),
+            "target: {:?}, points: {:#?}",
+            target,
+            points,
+        );
+    }
 }
-- 
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