Implement Clone trait for Options (#455)

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [Unreleased]
 
 * Export the `DEFAULT_COLUMN_FAMILY_NAME` constant.
+* Implement `Clone` trait for `Options`.
 
 ## 0.14.0 (2020-04-22)
 

src/db_options.rs

@@ -328,6 +328,16 @@ impl Drop for Options {
     }
 }
 
+impl Clone for Options {
+    fn clone(&self) -> Self {
+        let inner = unsafe { ffi::rocksdb_options_create_copy(self.inner) };
+        if inner.is_null() {
+            panic!("Could not copy RocksDB options");
+        }
+        Self { inner }
+    }
+}
+
 impl Drop for BlockBasedOptions {
     fn drop(&mut self) {
         unsafe {