209     return offset_of(BufferNode, _buffer);

   209     return offset_of(BufferNode, _buffer);

   210   }

   210   }

   211 

   211 

   212   static BufferNode* volatile* next_ptr(BufferNode& bn) { return &bn._next; }

   212   static BufferNode* volatile* next_ptr(BufferNode& bn) { return &bn._next; }

   213 

   213 

   215   // Allocate a new BufferNode with the "buffer" having size elements.

   214   // Allocate a new BufferNode with the "buffer" having size elements.

   216   static BufferNode* allocate(size_t size);

   215   static BufferNode* allocate(size_t size);

   217 

   216 

   218   // Free a BufferNode.

   217   // Free a BufferNode.

   219   static void deallocate(BufferNode* node);

   218   static void deallocate(BufferNode* node);