ScopeGuards as imagined here (Facebook's folly library has one) are near-essential for writing reasonable systems code in C++.

   int fd = socket(...);
   if (fd < 0) return false;
   SCOPE_EXIT { ::close(fd); };

   if (ioctl(fd, ...) != 0) return false;
   if (ioctl(fd, ...) != 0) return false;
   ...

   return true;

You could totally just write the FdWrapper class, but then you're still a user handling resource cleanup, but with more lines.