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

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+/***************************************************************************
+ *
+ * istringstream.cpp - basic_istringstream example
+ *
+ * $Id: istringstream.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 <iomanip>    // for setw
+#include <ios>        // for dec, hex, oct, right, showbase
+#include <iostream>   // for endl, wcout, wostream
+#include <locale>     // for isspace()
+#include <sstream>    // for strstream, wistringstream
+#include <string>     // for wstring
+
+#include <examples.h>
+
+
+int main ( )
+{
+    try {
+
+        // create a read/write stream object
+        std::wistringstream in (std::ios::in | std::ios::out);
+
+        // associate the ostream object's buffer with the ifstream object
+        std::wostream out (in.rdbuf ());
+
+        // enable exceptions in both streams
+        in.exceptions (std::ios::badbit);
+        out.exceptions (std::ios::failbit | std::ios::badbit);
+
+        // write string into out
+        out << L"Il avait l'air heureux." << std::endl;
+
+        // seek to the beginning of the stream
+        in.seekg (0);
+
+        wchar_t c;
+
+        // output each space-separated word on a separate line
+        while (in.get (c)) {
+            if ((std::isspace)(c, in.getloc ())) 
+                std::wcout << std::endl;
+            else
+                std::wcout.put(c);
+        }
+
+        std::wcout << std::endl;
+
+        // clear stream state, failbit | eofbit set by last call to get ()
+        in.clear ();
+
+        // move back to the beginning of the stream
+        in.seekg (0); 
+
+        wchar_t buf [40];
+
+        // guard against buffer overflow
+        in.width (sizeof buf);
+
+        // set right justification
+        std::wcout << 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::wcout.width (10);
+            std::wcout << buf << std::endl;
+        }
+    
+        std::wcout << std::endl;
+
+        // clear flags, last in >> buf set fail bit
+        // because of a newline at end of string
+        in.clear (); 
+
+        // output the base info before each integer
+        out << std::showbase;
+
+        std::wostream::pos_type pos= out.tellp ();
+
+        const long l = 10;
+        
+        // output l in hex with a field with of 10 
+        out << std::hex << std::setw (10) << l << std::endl;
+
+        // output l in oct with a field with of 10
+        out << std::oct << std::setw (10) << l << std::endl;
+
+        // output l in dec with a field with of 10
+        out << std::dec << std::setw (10) << l << std::endl;
+
+        // move back to the beginning of the stream
+        in.seekg (0);
+
+        // output the entire stream
+        std::wcout << in.rdbuf () << std::endl;
+
+        // clear the flags 
+        in.clear (); 
+
+        // seek the input sequence to pos  
+        in.seekg (pos);
+  
+        in.unsetf (std::ios::basefield);
+
+        int a, b, d;
+
+        // read the previous outputted integer
+        in >> a >> b >> d;
+
+        // output 3 times 10
+        std::wcout << a << std::endl << b << std::endl << d << std::endl;
+
+    }
+    catch (std::ios::failure &e) {
+        std::wcerr << e.what () << std::endl;
+    }
+ 
+    return 0;
+}