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

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+/***************************************************************************
+ *
+ * fstream.cpp - fstream example.
+ *
+ * $Id: fstream.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 fstream
+#include <iostream>   // for cout
+#include <string>     // for string
+
+#include <examples.h>
+
+int main ( )
+{
+    // create a bi-directional fstream object
+    std::fstream inout ("test_fstream.out",
+                        std::ios::in | std::ios::out | std::ios::trunc);
+
+    // write out three lines to the file
+    inout << "Dieses ist die Geschichte eines Mannes.\n"
+          << "C'est l'histoire d'un homme.\n"
+          << "This is the story of a man.\n";
+
+    std::string line;
+
+    // seek to the beginning of the file
+    inout.seekg (0);
+
+    // extract the first line
+    std::getline (inout, line);
+
+    // output the first line to standard output
+    std::cout << "\nDeutsch:\n" << line << '\n';
+
+    // obtain current position in file
+    const std::fstream::pos_type pos = inout.tellg ();
+
+    // extract the second line
+    std::getline (inout, line);
+
+    // output the second line to standard output
+    std::cout << "Francais:\n" << line << '\n';
+
+    // extract the third line
+    std::getline (inout, line);
+
+    // output the third line to standard output
+    std::cout << "English:\n" << line << '\n';
+ 
+    // move the put sequence before the second line
+    inout.seekp (pos);
+
+    // replace the second and third lines
+    inout << "This is the story of a man.\n"
+          << "C'est l'histoire d'un homme.";
+
+    // seek to the beginning of the file
+    inout.seekg (0);
+
+    // output the entire contents of the fstream object's buffer to stdout
+    std::cout << "\n" << inout.rdbuf () << '\n';
+
+    return 0;
+}