Class LockedPtr

include/behaviortree_cpp/utils/locked_reference.hpp:17–111

 */
template <typename T>
class LockedPtr
{
public:
  LockedPtr() = default;

  LockedPtr(T* obj, std::mutex* obj_mutex) : ref_(obj), mutex_(obj_mutex)
  {
    mutex_->lock();
  }

  ~LockedPtr()
  {
    if(mutex_ != nullptr)
    {
      mutex_->unlock();
    }
  }

  LockedPtr(LockedPtr const&) = delete;
  LockedPtr& operator=(LockedPtr const&) = delete;

  LockedPtr(LockedPtr&& other) noexcept
  {
    std::swap(ref_, other.ref_);
    std::swap(mutex_, other.mutex_);
  }

  LockedPtr& operator=(LockedPtr&& other) noexcept
  {
    std::swap(ref_, other.ref_);
    std::swap(mutex_, other.mutex_);
    return *this;
  }

  operator bool() const
  {
    return ref_ != nullptr;
  }

  void lock()
  {
    if(mutex_ != nullptr)
    {
      mutex_->lock();
    }
  }

  void unlock()
  {
    if(mutex_ != nullptr)
    {
      mutex_->unlock();
    }
  }

  const T* get() const
  {
    return ref_;