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

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+/***************************************************************************
+ *
+ * strstreambuf.cpp - strstreambuf example.
+ *
+ * $Id: strstreambuf.cpp 587173 2007-10-22 17:55:02Z 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, ends
+#include <iostream>    // for cerr, cout
+#include <strstream>   // for istream, ostrstream
+
+#include <examples.h>
+
+
+int main ()
+{
+    // create a write-only stream object
+    std::ostrstream out;
+
+    // tie the istream object to the ostrstream object
+    std::istream in (out.rdbuf ());   
+
+    // output to out
+    out << "Anticonstitutionnellement is a big word!!!\n";
+
+    // create a NTBS 
+    const char s[] ="Le rat des villes et le rat des champs.";
+
+    // output the NTBS
+    out << s << '\n';
+
+    // (try to) resize the buffer
+    if (out.rdbuf ()->pubsetbuf (0, 128L))
+        std::cout << "Successfully allocated buffer.\n";
+    else
+        std::cerr << "Failed to allocate buffer.\n";
+
+    // output the contents of the buffer to standard output
+    std::cout << in.rdbuf ();
+
+    // format a number into out
+    out << std::dec              // decimal base
+        << std::setfill ('#')    // set fill character
+        << std::setw (16)        // set field width
+        << 0x100 << '\n';        // format
+  
+    // output the content of the input sequence to standard output
+    std::cout << in.rdbuf( ) << '\n';
+
+    // number of elements in the output sequence
+    const std::streamsize pcount = std::streamsize (out.rdbuf ()->pcount ());
+
+    std::cout << "Buffer size is " << pcount << '\n';
+
+    // (try to) resize the buffer
+    if (out.rdbuf ()->pubsetbuf (0, pcount * 2L))
+        std::cout << "\nSuccessfully resized buffer to " << pcount * 2 << '\n';
+    else
+        std::cerr << "\nFailed to resize buffer to " << pcount * 2 << '\n';
+
+    // NUL-terminate the character array before streaming it out
+    out << std::ends;
+
+    // output the contents of the streambuf object associated with out
+    std::cout << out.rdbuf ()->str ();
+
+    // unfreeze the streambuf so it cleans up its allocated memory
+    out.rdbuf ()->freeze (false);
+
+    return 0;
+}