Standard hierarchy

streambuf		filebuf
		stringbuf

Public member functions:

pubimbue	Imbue locale
getloc	Get current locale
pubsetbuf	Set buffer array
pubseekoff	Set relative position of internal position pointer
pubseekpos	Set absolute position of internal position pointer
pubsync	Synchronize stream
in_avail	Get number of characters available in input buffer
snextc	Increase get pointer and return next character
sbumpc	Get current character and increase get pointer
sgetc	Get current character
sgetn	Get some characters
sputbackc	Put character back
sungetc	Decrease get pointer
sputc	Store character at current put position and increase put pointer
sputn	Write some characters
(destructor)	No-op [virtual]

Protected member functions:

(constructor)	Construct an object
eback	Get pointer to beginning of input sequence
egptr	Get pointer to end of input seuqence
epptr	Get pointer to end of output sequence
gbump	Increase get pointer
gptr	Return get pointer
pbase	Get pointer to beginning of output sequence
pbump	Increase put pointer
pptr	Return put pointer
setg	Set input buffer pointers
setp	Set output buffer pointers
imbue	Imbue locale [virtual]
overflow	Put character at current position [virtual]
pbackfail	Put character back [virtual]
seekoff	Set relative position of internal position pointer [virtual]
seekpos	Set absolute position of internal position pointer [virtual]
setbuf	Set buffer [virtual]
showmanyc	Get number of characters availbale in input sequence [virtual]
sync	Synchronize stream buffer [virtual]
uflow	Get current character [virtual]
underflow	Get current character [virtual]
xsgetn	Get some characters [virtual]
xsputn	Write some characters [virtual]

Description:

Public members

These provide the interface to interact with the class with members common to all streambuf-derived objects. They are strongly dependent on the protected members. Depending on wether they affect the input sequence, the ouput sequence, both or the locale they fall into these categories:

• Sequence management and positioning: pubsetbuf, pubseekoff, pubseekpos and pubsync.
• Input sequence specific (get): in_avail, snextc, sbumpc, sgetc, sgetn, sputbackc and sungetc.
• Output sequence specific (put): sputc and sputn.
• Locales: pubimbue and pubimbue.

Protected members (non-virtual)

These provide an internal interface that is used by other members to access the internal pointers. Each streambuf-derived class can access the three internal pointers that determine the boundaries and the current position of the input sequence and the three internal pointers that determine the output sequence. These pointers and the functions to access their values for the input and output sequence are:

Internal pointer	input sequence	output sequence
Beginning of sequence	eback	pbase
Next element in the sequence	gptr	pptr
End (just past last element) of sequence	egptr	epptr

  The values of all these internal pointers may be modified by calling members setg for the ones of the input sequence and setp for the pointers of the output sequence.
  gptr and pptr are known as get pointer and put pointer and may be increased by calling gbump and pbump respectivelly.

Virtual protected members

These members are designed to be overriden by derived classes. Most of them expect a very specific behavior in the derived class because they are called by other non-virtual members.
These members have a very important function in the derived classes; They are in charge of performing the physical input and ouput operations and translations between a physical or logical device (like a file) and the internal sequences of characters (simple arrays in memory).