MoveOnly utility

[folly.git] / folly / Utility.h

diff --git a/folly/Utility.h b/folly/Utility.h
index 4d6725d7070ec70e9684d19db915100c6fc5e9cc..1d3786181458768f1f8efcb04030b0a6ac963dc8 100644 (file)
--- a/folly/Utility.h
+++ b/folly/Utility.h
@@ -158,4 +158,27 @@ struct Identity {
     return static_cast<T&&>(x);
   }
 };
-}
+
+namespace moveonly_ { // Protection from unintended ADL.
+
+/**
+ * Disallow copy but not move in derived types. This is essentially
+ * boost::noncopyable (the implementation is almost identical) but it
+ * doesn't delete move constructor and move assignment.
+ */
+class MoveOnly {
+ protected:
+  constexpr MoveOnly() = default;
+  ~MoveOnly() = default;
+
+  MoveOnly(MoveOnly&&) = default;
+  MoveOnly& operator=(MoveOnly&&) = default;
+  MoveOnly(const MoveOnly&) = delete;
+  MoveOnly& operator=(const MoveOnly&) = delete;
+};
+
+} // namespace moveonly_
+
+using MoveOnly = moveonly_::MoveOnly;
+
+} // namespace folly