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

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+/**************************************************************************
+ *
+ * collate.cpp - Example program of collate facet. 
+ *
+ * $Id: collate.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 <iostream>   // for cout
+#include <locale>     // for collate
+
+#include <examples.h>
+
+int main ()
+{
+    const std::string s1 ("blue");
+    const std::string s2 ("blues");
+
+    std::cout <<   "String 1 : " << s1
+              << "\nString 2 : " << s2 << '\n';
+
+    // obtain a reference to the collate facet
+    // installed in the locale imbued in cout
+    const std::collate<char>& co =
+        std::use_facet<std::collate<char> >(std::cout.getloc ());
+
+    // use the facet to compare the two strings
+    int res = co.compare (s1.c_str (), s1.c_str () + s1.length (), 
+                          s2.c_str (), s2.c_str () + s2.length () - 1);
+    
+    // strings should collate equal
+    std::cout << "Strings \""
+              << s1.substr(0, s1.length ()) << "\" and \""
+              << s2.substr(0, s2.length () - 1)
+              << "\" should compare equal      : "
+              << (res ? "not " : "") << "equal\n";
+
+    res = co.compare (s1.c_str (), s1.c_str () + s1.length (), 
+                      s2.c_str (), s2.c_str () + s2.length ());
+
+    // strings should collate unequal
+    std::cout << "Strings \""
+              << s1.c_str () << "\" and \"" << s2.c_str ()
+              << "\" should compare NOT equal : "
+              << (res ? "not " : "") << "equal\n";
+
+    // compute hash values for the two strings
+    // expected values:
+    //   ILP32:     431029 and      6896579
+    //   LP64:  1651275109 and 422726428019
+    const long hash1 = co.hash (s1.c_str (), s1.c_str () + s1.length ());
+    const long hash2 = co.hash (s2.c_str (), s2.c_str () + s2.length ());
+
+    // normalize the two hash values for portability
+    // between 32-bit and 64-bit longs
+    const long norm1 =  440460L;
+    const long norm2 = 7898347L;
+
+    // expect 431029 on output
+    std::cout << "Normalized hash value for \"" << s1.c_str () << "\"  : "
+              <<  hash1 % norm1
+              << "\nNormalized hash value for \"" << s2.c_str () << "\" : "
+              <<  hash2 % norm2
+              << '\n';
+
+    return 0;
+}