refs #485, Restricted<T>

src/blackmisc/restricted.h

@@ -0,0 +1,30 @@
+/* Copyright (C) 2016
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_RESTRICTED_H
+#define BLACKMISC_RESTRICTED_H
+
+namespace BlackMisc
+{
+    /*!
+     * Restricted<T> is just an empty class, that can only be constructed by the class T.
+     */
+    template <typename T> class Restricted
+    {
+    private:
+        friend T;
+
+        //! Constructor is only available to the template parameter T.
+        Restricted() {}
+    };
+}
+
+#endif //  guard