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Extending the Basic Streams in C++


The basic stream library (iostream) is designed to resolve most of the general problems you may run into during your programming endeavors. However, sometimes it simply isn't enough, and you need to extend it to suit your application—your special situation. This article will show you how to do that.

Author Info:
By: Gabor Bernat
Rating: 5 stars5 stars5 stars5 stars5 stars / 4
May 19, 2009
TABLE OF CONTENTS:
  1. · Extending the Basic Streams in C++
  2. · The Source of it All
  3. · The streambuff Class
  4. · Epilogue

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Extending the Basic Streams in C++ - The Source of it All
(Page 2 of 4 )

First, let me tell you that there are three types of streams in C++, namely the fstream (for file I/O), the sstream (for C type character sequences - char*- however this is a leftover from the days of C++ standardization for compatibility reasons and should not be used, as support for this in the future may be removed; this isn't a template class) and strstream (for the string type of the STL library). Now all of these will have in common the fact that the text stored eventually is a text. That is why the following code snippet succeeds in execution:



#include <iostream>

#include <sstream>

#include <strstream>


using namespace std;


char alfa = 'A';


template < typename _S>

std::basic_ostream<_S>& fillWithText (std::basic_ostream<_S>& stream)

{

stream << "Filled with text the " << alfa++ << "Stream"<< std::endl;

return stream;

}


int main()

{

wostringstream A;

wostream& B = std::wcout;

 

fillWithText<wchar_t>(A);

std::wcout << A.str();

 

fillWithText<wchar_t>(B);


}


Moreover, the result is:


Filled with text the A Stream

Filled with text the B Stream

Press any key to continue . . .


First, let's point out that you can assign a string to the standard input/output, and in the future thread it just as the cout stream class. Second, look at the way we printed the A stream. The str() function returns a pointer to the character sequence inside the stream itself, though it will print all that we put inside it in the meantime.

The existence of this pointer can be reduced to the inside representation of a stream. The streambuff class handles this. A schematic representation looks like the figure below.




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