completed 04 traits

exercises/04_traits/13_drop/src/lib.rs

@@ -1,6 +1,28 @@
 // TODO: implement a so-called "Drop bomb": a type that panics when dropped
 //  unless a certain operation has been performed on it.
 //  You can see the expected API in the tests below.
+#[derive(Debug, Clone)]
+pub struct DropBomb {
+    a: bool,
+}
+
+impl DropBomb {
+    fn new() -> DropBomb {
+        DropBomb { a: false }
+    }
+
+    fn defuse(&mut self) {
+        self.a = true;
+    }
+}
+
+impl Drop for DropBomb {
+    fn drop(&mut self) {
+        if !self.a {
+            panic!("Not Defused!!")
+        }
+    }
+}
 
 #[cfg(test)]
 mod tests {