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

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+/***************************************************************************
+ *
+ * filebuf.cpp - basic_filebuf example
+ *
+ * $Id: filebuf.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 filebuf, ifstream, istream
+#include <iostream>   // for cout, endl
+#include <cstdio>     // for tmpnam(), remove()
+
+#include <examples.h>
+
+int main ()
+{
+#ifndef _RWSTD_NO_EXT_FILEBUF
+
+    // 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_NO_EXT_FILEBUF)
+
+    char fnamebuf [L_tmpnam];
+
+    // create a temporary filename
+    const char* const fname = std::tmpnam (fnamebuf);
+
+    if (!fname)
+        return 1;
+
+#endif   // _RWSTD_NO_EXT_FILEBUF
+
+    // create a filebuf object for reading and writing of a temporary file
+    std::filebuf outbuf;
+
+    outbuf.open (fname, std::ios::in | std::ios::out | std::ios::trunc);
+
+    // set the internal character buffer size
+    // buffer will be allocated internally and deallocated in object dtor
+    outbuf.pubsetbuf (0, 256);
+ 
+    // associate the filebuf object with an iostream object
+    std::iostream out (&outbuf);
+
+    // open this source code file and output it to the temporary file
+    out << std::ifstream (__FILE__).rdbuf ();
+  
+    // seek to the beginning of the stream
+    out.seekp (0);
+
+    // output the contents of the `out' object to standard output
+    std::cout << out.rdbuf ();  
+
+    // close the filebuf object before removing the underlying file
+    outbuf.close ();
+  
+    if (fname) {
+        // remove the temporary file if it has a name
+        // otherwise, if fname is NULL, the temporary file will
+        // have already been automatically removed by the call
+        // to close() above
+        std::remove (fname);
+    }
+
+    return 0;
+}