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

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+/**************************************************************************
+ *
+ * rndshufl.cpp - Example program of random shuffle algorithm.
+ *
+ * $Id: random_shuffle.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 1994-2008 Rogue Wave Software, Inc.
+ * 
+ **************************************************************************/
+
+#include <algorithm>   // for random_shuffle
+#include <iostream>    // for cout
+#include <iterator>    // for ostream_iterator
+#include <string>      // for string
+
+// #include <examples.h>
+
+
+int main ()
+{
+    // Create a string of doubles (unusual? maybe, but why not...)
+    typedef std::char_traits<double>                     Traits;
+    typedef std::allocator<double>                       Allocator;
+    typedef std::basic_string<double, Traits, Allocator> Bizarre;
+
+    // Initialize a Bizarre with an array of values.
+    const Bizarre::value_type a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+
+    Bizarre b (a + 0, a + sizeof a / sizeof *a);
+
+    typedef std::ostream_iterator<double, char, std::char_traits<char> >
+        Iter;
+
+    // Suppress decimal point in output.
+    std::cout.precision (0);
+    std::cout.setf (std::cout.fixed, std::cout.floatfield);
+
+    // Print out elements in original (sorted) order.
+    std::cout << "Elements before random_shuffle: \n     ";
+    std::copy (b.begin (), b.end (), Iter (std::cout," "));
+
+    // Mix them up with random_shuffle.
+    std::random_shuffle (b.begin (), b.end ());
+
+    // Print out the mixed up elements.
+    std::cout << "\n\nElements after random_shuffle: \n     ";
+    std::copy (b.begin (), b.end (), Iter (std::cout, " "));
+    std::cout << '\n';
+
+    return 0;
+}