std::basic_fstream(3cxx) on Linux
The text c7aab1a2cd65, as Debian 6.0 (Squeeze) shipped it.
Controlling input and output for files. This class supports reading from and writing to named files, using the inherited functions from std::basic_iostream. To control the associated sequence, an instance of std::basic_filebuf is used, which this page refers to as sb.