std::basic_ostringstream(3cxx) on Linux
The text 0eb6ad46cf82, as Debian 6.0 (Squeeze) shipped it.
Controlling output for std::string. This class supports writing to objects of type std::basic_string, using the inherited functions from std::basic_ostream. To control the associated sequence, an instance of std::basic_stringbuf is used, which this page refers to as sb.