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

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+/**************************************************************************
+ *
+ * codecvt.cpp - Example program of codecvt facet. 
+ *
+ * $Id: codecvt.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 1998-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+ 
+#include <iostream>
+
+#include <codecvte.h>
+#include <examples.h>
+
+int main ()
+{
+    // not used, must be zero-initialized and supplied to facet
+    std::mbstate_t state = std::mbstate_t ();
+
+    // three strings to use as buffers
+    std::string ins ("\xfc \xcc \xcd \x61 \xe1 \xd9 \xc6 \xe6 \xf5");
+    std::string ins2 (ins.size (), '.');
+    std::string outs (ins.size () / ex_codecvt ().encoding (), '.');
+
+    // Print initial contents of buffers
+    std::cout << "Before:\n"
+              << ins << '\n'
+              << ins2 << '\n'
+              << outs << '\n' << '\n';
+
+    // Create a user defined codecvt fact
+    // This facet converts from ISO Latin Alphabet No. 1 (ISO 8859-1)
+    // to  U.S. ASCII code page 437.
+
+    // Replace the default codecvt<char, char, mbstate_t>.
+    std::locale loc (std::cout.getloc (), new ex_codecvt);
+
+    // Retrieve the facet from the locale.
+    typedef std::codecvt<char, char, std::mbstate_t> CodeCvt;
+    const CodeCvt& cdcvt = std::use_facet<CodeCvt>(loc);
+
+    // unused, must be provided to codecvt<>::in/out
+    const char *const_out_next = 0;
+    const char *const_in_next  = 0;
+          char *in_next        = 0;
+          char *out_next       = 0;
+
+    // convert the buffer
+    cdcvt.in (state, ins.c_str (), ins.c_str () + ins.length (), const_in_next,
+              &outs [0], &outs [0] + outs.length (), out_next);
+
+    std::cout << "After in:\n"
+              << ins << '\n'
+              << ins2 << '\n'
+              << outs << "\n\n";
+
+    // zero-initialize (unused) state object
+    state = std::mbstate_t ();
+
+    // Finally, convert back to the original codeset
+    cdcvt.out (state, outs.c_str (), outs.c_str () + outs.length (),
+               const_out_next, &ins [0], &ins [0] + ins.length (), in_next);
+
+    std::cout << "After out:\n"
+              << ins << '\n'
+              << ins2 << '\n'
+              << outs << '\n';
+
+    return 0;
+}