1 files changed, 20 insertions, 0 deletions
diff --git a/src/keyed.hpp b/src/keyed.hpp
new file mode 100644
index 0000000..de3500e
--- /dev/null
+++ b/src/keyed.hpp
@@ -0,0 +1,20 @@
+#ifndef WANDA_KEYED_HPP
+#define WANDA_KEYED_HPP
+
+namespace wanda
+{
+
+template <typename Derived>
+struct keyed
+{
+  protected:
+    struct key
+    {
+    };
+
+    explicit keyed(key) {}
+};
+
+} // namespace wanda
+
+#endif
+\ No newline at end of file