ceph/src/common/ref.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef COMMON_REF_H
   5 #define COMMON_REF_H
   6
   7 #include <boost/intrusive_ptr.hpp>
   8
   9 namespace ceph {
  10 template<typename T> using ref_t = boost::intrusive_ptr<T>;
  11 template<typename T> using cref_t = boost::intrusive_ptr<const T>;
  12 template<class T, class U>
  13 ref_t<T> ref_cast(const ref_t<U>& r) noexcept {
  14   return static_cast<T*>(r.get());
  15 }
  16 template<class T, class U>
  17 ref_t<T> ref_cast(ref_t<U>&& r) noexcept {
  18   return {static_cast<T*>(r.detach()), false};
  19 }
  20 template<class T, class U>
  21 cref_t<T> ref_cast(const cref_t<U>& r) noexcept {
  22   return static_cast<const T*>(r.get());
  23 }
  24 template<class T, typename... Args>
  25 ceph::ref_t<T> make_ref(Args&&... args) {
  26   return {new T(std::forward<Args>(args)...), false};
  27 }
  28 }
  29
  30 // Friends cannot be partial specializations: https://en.cppreference.com/w/cpp/language/friend
  31 #define FRIEND_MAKE_REF(C) \
  32 template<class T, typename... Args> friend ceph::ref_t<T> ceph::make_ref(Args&&... args)
  33
  34 #endif