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

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+/***************************************************************************
+ *
+ * ifstream.cpp - basic_ifstream example.
+ *
+ * $Id: ifstream.cpp 648752 2008-04-16 17:01:56Z faridz $
+ *
+ ***************************************************************************
+ *
+ * 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 <iomanip>    // for setw
+#include <ios>        // for dec, hex, oct, right, showbase
+#include <iostream>   // for cerr, cout
+#include <locale>     // for isspace()
+
+#include <examples.h>
+
+
+int main ( )
+{
+    const char ntbs[] = "Le minot passait la piece a frotter.";
+
+    try {
+
+        // create a read/write file-stream object
+        std::ifstream in ("ifstream.results.out",
+                          std::ios::in | std::ios::out | std::ios::trunc);
+
+        if (!in.is_open ()) 
+            throw (std::ios::failure ("open error"));
+
+        // associate the ostream object's buffer with the ifstream object
+        std::ostream out (in.rdbuf ());   
+
+        // output ntbs in out
+        out << ntbs << '\n';
+
+        // seek to the beginning of the file
+        in.seekg (0);
+
+        char c;
+
+        // output each space-separated word on a separate line
+        while (in.get (c)) {
+            if ((std::isspace)(c, in.getloc ())) 
+                std::cout << '\n';
+            else
+                std::cout << c;
+        }
+
+        std::cout << '\n';
+
+        // clear stream state, failbit | eofbit set by last call to get ()
+        in.clear ();
+
+        // move back to the beginning of the file
+        in.seekg (0); 
+
+        char buf [40];
+
+        // guard against buffer overflow
+        in.width (sizeof buf);
+
+        // set right justification
+        std::cout << std::right;
+
+        // does the same thing as the previous code
+        // output each word on a separate line in a field of width 10
+        while (in >> buf) {
+            std::cout.width (10);
+            std::cout << buf << '\n';
+        }
+    
+        std::cout << '\n';
+
+        // clear the stream state
+        in.clear (); 
+
+        // output the base info before each integer
+        out << std::showbase;
+
+        std::ostream::pos_type pos= out.tellp ();
+
+        const long x = 10;
+        
+        // output x in hex with a field with of 10 
+        out << std::hex << std::setw (10) << x << '\n';
+
+        // output x in oct with a field with of 10
+        out << std::oct << std::setw (10) << x << '\n';
+
+        // output x in dec with a field with of 10
+        out << std::dec << std::setw (10) << x << '\n';
+
+        // move back to the beginning of the file
+        in.seekg (0);
+
+        // output the entire file
+        std::cout << in.rdbuf () << '\n';
+
+        // clear the stream state
+        in.clear (); 
+
+        // seek the input sequence to pos  
+        in.seekg (pos);
+  
+        long a = 0;
+        long b = 0;
+        long d = 0;
+
+        in.unsetf (std::ios::basefield);
+
+        // read the previous outputted integer
+        in >> a >> b >> d;
+
+        // output 3 times 10
+        std::cout << a << '\n' << b << '\n' << d << '\n';
+    }
+    catch (std::ios::failure e) {
+        std::cerr << e.what () << '\n';
+    }
+ 
+    return 0;
+}