source: clean up structure

1 files changed, 28 insertions, 0 deletions

diff --git a/source/lib/include/wanda/keyed.hpp b/source/lib/include/wanda/keyed.hpp
new file mode 100644
index 0000000..58f17ad
--- /dev/null
+++ b/source/lib/include/wanda/keyed.hpp
@@ -0,0 +1,28 @@
+/**
+ * @file   keyed.hpp
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @since  1.0.0
+ */
+
+#ifndef WANDA_KEYED_HPP
+#define WANDA_KEYED_HPP
+
+namespace wanda
+{
+  /**
+   * @brief A tag type to prevent construction of a type without a factory
+   */
+  template<typename Derived>
+  struct keyed
+  {
+  protected:
+    struct key
+    {
+    };
+
+    explicit keyed(key) {}
+  };
+
+}  // namespace wanda
+
+#endif
\ No newline at end of file