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  1. Friedrich-Alexander-Universität
  2. Technische Fakultät
  3. Department Informatik
Friedrich-Alexander-Universität Lehrstuhl für Informatik 4 (Systemsoftware)
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      • Aufgabe 0: C++ Streams
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                              Aufgabe 2: Unterbrechungen

                              Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
                              Stringbuffer Class Referenceabstract

                              The class Stringbuffer composes single characters into a longer text that can be processed on block. More...

                              #include <object/stringbuffer.h>

                              + Inheritance diagram for Stringbuffer:
                              [legend]

                              Public Member Functions

                              virtual ~Stringbuffer ()
                               Destructor (nothing to do here)
                               

                              Protected Member Functions

                               Stringbuffer ()
                               Constructor; Marks the buffer as empty.
                               
                              void put (char c)
                               Inserts a character into the buffer. More...
                               
                              virtual void flush ()=0
                               Flush the buffer contents. More...
                               

                              Protected Attributes

                              char buffer [80]
                               buffer containing characters that will be printed upon flush()
                               
                              long unsigned pos
                               current position in the buffer
                               

                              Detailed Description

                              The class Stringbuffer composes single characters into a longer text that can be processed on block.

                              To make Stringbuffer as versatile as possible, the class does make assumptions about neither the underlying hardware, nor the meaning of "processing". When flush() is called (i.e., either on explicit request or once the buffer is full). To be hardware independent, flush() is to be implemented by the derived classes.

                              Hints for Implementation
                              Use a buffer of fixed size for caching characters, which should be accessible by derived classes. Keep in mind that the derived implementation of flush() will need to know about numbers of characters in the buffer.
                              Notes
                              Reason for the existence of this class is that generating longer texts is often implemented by assembly of small fragments (such as single characters or numbers). However, writing such small fragments directly to (for example) screen is quite inefficient (e.g., due to the use of IO ports, syscalls, or locks) and can be improved drastically by delaying the output step until the assembly is finished (or the buffer runs full).

                              Member Function Documentation

                              void Stringbuffer::put ( char  c)
                              protected

                              Inserts a character into the buffer.

                              Once the buffer is full, a call to flush() will be issued and thereby clearing the buffer.

                              Parameters
                              cChar to be added
                              virtual void Stringbuffer::flush ( )
                              protectedpure virtual

                              Flush the buffer contents.

                              This method is to be defined in derived classes, as only those know how to print characters. flush() is required to reset the position pos.

                              Implemented in SerialStream, TextStream, ConsoleOut, FileOut, and OutputStream.


                              The documentation for this class was generated from the following files:
                              • object/stringbuffer.h
                              • object/stringbuffer.cc
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