ostreambuf_iterator.cpp

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#include <fstream>    // for filebuf
#include <iostream>   // for cout
#include <iterator>   // for streambuf_iterator's
#include <cstdio>     // for L_tmpnam, tmpnam and remove
 
#include <examples.h>
 
 
int main ( )
{
#ifndef _RWSTD_STRICT_ANSI
 
    // use an extension of this implementation: NULL file name argument
    // creates a temporary file; closing the file stream object or its
    // associated filebuf removes the temporary file
    const char* const fname = 0;
    
#else   // if defined (_RWSTD_STRICT_ANSI)
 
    char fnamebuf [L_tmpnam];
 
    // create a temporary filename
    const char* const fname = std::tmpnam (fnamebuf);
 
    if (!fname)
        return 1;
 
#endif   // _RWSTD_STRICT_ANSI
 
    // create a filebuf object
    std::filebuf buf;
 
    // open the file and link it to the filebuf object
    buf.open (fname, std::ios::in | std::ios::out | std::ios::trunc);
 
    // create an ostreambuf_iterator and link it to 
    // the filebuf object
    std::ostreambuf_iterator<char, std::char_traits<char> > out_iter (&buf);
 
    const char charset[] =
        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
 
    // output characters into the file using the ostreambuf_iterator
    for (unsigned i = 0; charset [i]; ++i)
        out_iter = charset [i];
 
    // seek to the beginning of the file
    buf.pubseekpos(0);
  
    // create an istreambuf_iterator and link it to  the filebuf object
    std::istreambuf_iterator<char, std::char_traits<char> > in_iter (&buf);
 
    // construct an end of stream iterator
    std::istreambuf_iterator<char, std::char_traits<char> > end;
 
    std::cout << '\n';
 
    // output the contents of the file
    while (!in_iter.equal (end))
        std::cout << *in_iter++;
 
    std::cout << '\n';
 
    if (fname) {
        // close the stream before removing the file
        buf.close ();
 
        // remove the temporary file (must have a name)
        std::remove (fname);
    }
 
    return 0;
}