June 2018 Update

Task/Binary-search/Rust/binary-search-2.rust

@@ -0,0 +1,18 @@
+use std::cmp::Ordering::*;
+fn binary_search<T: Ord>(arr: &[T], elem: &T) -> Option<usize>
+{
+    let mut size = arr.len();
+    let mut base = 0;
+
+    while size > 0 {
+        size /= 2;
+        let mid = base + size;
+        base = match arr[mid].cmp(elem) {
+            Less    => mid,
+            Greater => base,
+            Equal   => return Some(mid)
+        };
+    }
+
+    None
+}