[streambuf.syn]
31 Input/output library [input.output]
31.6 Stream buffers [stream.buffers]
31.6.1 Header <streambuf> synopsis [streambuf.syn]
namespace std { // [streambuf], class template basic_streambuf template<class charT, class traits = char_traits<charT>> class basic_streambuf; using streambuf = basic_streambuf<char>; using wstreambuf = basic_streambuf<wchar_t>; }