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extern/stdcxx/4.2.1/examples/manual/istreambuf_iterator.cpp

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+/***************************************************************************
+ *
+ * istreambuf_iterator.cpp - istreambuf_iterator example
+ *
+ * $Id: istreambuf_iterator.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+ 
+#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;
+}