add data::Wrap

iface/CMakeLists.txt

@@ -21,6 +21,7 @@ target_sources(nf7_iface
     common/task_context.hh
     common/value.hh
     data/interface.hh
+    data/wrap.hh
     subsys/concurrency.hh
     subsys/interface.hh
     subsys/logger.hh

iface/data/wrap.hh

@@ -0,0 +1,21 @@
+// No copyright
+#pragma once
+
+#include "iface/data/interface.hh"
+
+namespace nf7::data {
+
+template <typename T>
+class Wrap : public Interface {
+ protected:
+  Wrap(const char* name, T& data) noexcept
+      : Interface(name), data_(data) { }
+
+ public:
+  T& data() const noexcept { return data_; }
+
+ private:
+  T& data_;
+};
+
+}  // namespace nf7::data