1 files changed, 32 insertions, 0 deletions
diff --git a/src/common/buffer_instrumentation.h b/src/common/buffer_instrumentation.h
new file mode 100644
index 000000000..fa1e84307
--- /dev/null
+++ b/src/common/buffer_instrumentation.h
@@ -0,0 +1,32 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "include/buffer.h"
+#include "include/buffer_raw.h"
+
+namespace ceph::buffer_instrumentation {
+
+// this is nothing more than an intermediary for a class hierarchy which
+// can placed between a user's custom raw and the `ceph::buffer::raw` to
+// detect whether a given `ceph::buffer::ptr` instance wraps a particular
+// raw's implementation (via `dynamic_cast` or `typeid`).
+//
+// users are supposed to define marker type (e.g. `class my_marker{}`).
+// this marker. i
+template <class MarkerT>
+struct instrumented_raw : public ceph::buffer::raw {
+  using raw::raw;
+};
+
+struct instrumented_bptr : public ceph::buffer::ptr {
+  const ceph::buffer::raw* get_raw() const {
+    return _raw;
+  }
+
+  template <class MarkerT>
+  bool is_raw_marked() const {
+    return dynamic_cast<const instrumented_raw<MarkerT>*>(get_raw()) != nullptr;
+  }
+};
+
+} // namespace ceph::buffer_instrumentation