istreambuf_iterator.cpp

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#include <fstream>    // for ofstream, istreambuf_iterator
#include <iostream>   // for cout
#include <cstdio>     // for 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
 
    // open the file is_iter.out for reading and writing
    std::ofstream out (fname, std::ios::out | std::ios::in | std::ios::trunc);
 
    // output the example sentence into the file
    out << "Ceci est un simple exemple pour demontrer le\n"
           "fonctionnement de istreambuf_iterator.";
 
    // seek to the beginning of the file
    out.seekp (0);
 
    // construct an istreambuf_iterator pointing to
    // the ofstream object underlying streambuffer
    std::istreambuf_iterator<char, std::char_traits<char> > iter (out.rdbuf ());
 
    // construct an end of stream iterator
    const std::istreambuf_iterator<char, std::char_traits<char> > end;
 
    std::cout << '\n';
 
    // output the content of the file
    while (!iter.equal (end)) {
 
        // use both operator++ and operator*
        std::cout << *iter++;
    }
 
    std::cout << '\n';
 
    if (fname) {
        // close the stream before removing the file
        out.close ();
 
        // remove the temporary file (must have a name)
        std::remove (fname);
    }
 
    return 0;
}