Library: Foundation
Package: Streams
Header: Poco/UnbufferedStreamBuf.h
Description
This is an implementation of an unbuffered streambuf that greatly simplifies the implementation of custom streambufs of various kinds. Derived classes only have to override the methods readFromDevice() or writeToDevice().
Inheritance
Direct Base Classes: std::basic_streambuf < ch, tr >
All Base Classes: std::basic_streambuf < ch, tr >
Member Summary
Member Functions: charToInt, overflow, pbackfail, uflow, underflow, xsgetn
Types
Base 
typedef std::basic_streambuf < ch, tr > Base;
IOS
typedef std::basic_ios < ch, tr > IOS;
char_traits
typedef tr char_traits;
char_type
typedef ch char_type;
int_type
typedef typename Base::int_type int_type;
off_type
typedef typename Base::off_type off_type;
openmode
typedef typename IOS::openmode openmode;
pos_type
typedef typename Base::pos_type pos_type;
Constructors
BasicUnbufferedStreamBuf 
Destructor
~BasicUnbufferedStreamBuf
Member Functions
overflow 
virtual int_type overflow(
int_type c
);
pbackfail
virtual int_type pbackfail(
int_type c
);
uflow
virtual int_type uflow();
underflow
virtual int_type underflow();
xsgetn
virtual std::streamsize xsgetn(
char_type * p,
std::streamsize count
);
Some platforms (for example, Compaq C++) have buggy implementations of xsgetn that handle null buffers incorrectly. Anyway, it does not hurt to provide an optimized implementation of xsgetn for this streambuf implementation.
charToInt 
static int_type charToInt(
char_type c
);