27 Input/output library [input.output]

27.6 Stream buffers [stream.buffers]

27.6.3 Class template basic_­streambuf [streambuf]

27.6.3.2 Public member functions [streambuf.members]

27.6.3.2.3 Get area [streambuf.pub.get]

streamsize in_avail();
Returns: If a read position is available, returns egptr() - gptr().
Otherwise returns showmanyc().
int_type snextc();
Effects: Calls sbumpc().
Returns: If that function returns traits::eof(), returns traits::eof().
Otherwise, returns sgetc().
int_type sbumpc();
Returns: If the input sequence read position is not available, returns uflow().
Otherwise, returns traits::to_­int_­type(*gptr()) and increments the next pointer for the input sequence.
int_type sgetc();
Returns: If the input sequence read position is not available, returns underflow().
Otherwise, returns traits::to_­int_­type(*gptr()).
streamsize sgetn(char_type* s, streamsize n);
Returns: xsgetn(s, n).