ceph/src/common/buffer_instrumentation.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "include/buffer.h"
   5 #include "include/buffer_raw.h"
   6
   7 namespace ceph::buffer_instrumentation {
   8
   9 // this is nothing more than an intermediary for a class hierarchy which
  10 // can placed between a user's custom raw and the `ceph::buffer::raw` to
  11 // detect whether a given `ceph::buffer::ptr` instance wraps a particular
  12 // raw's implementation (via `dynamic_cast` or `typeid`).
  13 //
  14 // users are supposed to define marker type (e.g. `class my_marker{}`).
  15 // this marker. i
  16 template <class MarkerT>
  17 struct instrumented_raw : public ceph::buffer::raw {
  18   using raw::raw;
  19 };
  20
  21 struct instrumented_bptr : public ceph::buffer::ptr {
  22   const ceph::buffer::raw* get_raw() const {
  23     return _raw;
  24   }
  25
  26   template <class MarkerT>
  27   bool is_raw_marked() const {
  28     return dynamic_cast<const instrumented_raw<MarkerT>*>(get_raw()) != nullptr;
  29   }
  30 };
  31
  32 } // namespace ceph::buffer_instrumentation