src/cpp-common/bt2/borrowed-object-proxy.hpp

   1 /*
   2  * Copyright (c) 2023 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef BABELTRACE_CPP_COMMON_BT2_BORROWED_OBJECT_PROXY_HPP
   8 #define BABELTRACE_CPP_COMMON_BT2_BORROWED_OBJECT_PROXY_HPP
   9
  10 namespace bt2 {
  11
  12 /*
  13  * A proxy containing a valid borrowed object instance of `ObjT` to make
  14  * Something::operator->() work when only a libbabeltrace2 object
  15  * pointer is available.
  16  */
  17 template <typename ObjT>
  18 class BorrowedObjectProxy final
  19 {
  20 public:
  21     explicit BorrowedObjectProxy(typename ObjT::LibObjPtr libObjPtr) noexcept : _mObj {libObjPtr}
  22     {
  23     }
  24
  25     const ObjT *operator->() const noexcept
  26     {
  27         return &_mObj;
  28     }
  29
  30 private:
  31     ObjT _mObj;
  32 };
  33
  34 } /* namespace bt2 */
  35
  36 #endif /* BABELTRACE_CPP_COMMON_BT2_BORROWED_OBJECT_PROXY_HPP */