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extern/stdcxx/4.2.1/examples/tutorial/radix.cpp

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+/**************************************************************************
+ *
+ * radix.cpp - Radix sort employing various STL classes.
+ *
+ * $Id: radix.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 <deque>
+#include <list>
+#include <vector>
+#include <algorithm>
+#include <numeric>
+#include <iostream>
+#include <iterator>
+
+#include <examples.h>
+
+typedef std::deque<int, std::allocator<int> >                     IntDeque;
+typedef std::vector<IntDeque, std::allocator<IntDeque> >          DeqVector;
+typedef std::list<int, std::allocator<int> >                      IntList;
+typedef std::ostream_iterator<int, char, std::char_traits<char> > OstreamIter;
+
+
+class copyIntoBuckets {
+public:
+    copyIntoBuckets (int d, DeqVector &b, bool &f)
+      : divisor (d), buckets (b), flag (f)
+        {}
+
+    void operator () (unsigned int v) {
+        const int inx = (v / divisor) % 10;
+        // flag set to true if any bucket other than the 0-th one is used
+        if (inx)
+            flag = true; 
+        buckets [inx].push_back (v);
+    }
+
+    int        divisor;
+    DeqVector &buckets;
+    bool      &flag;
+};
+
+
+IntList::iterator
+copyList (IntList::iterator c, IntDeque &lst) {
+    
+    return std::copy (lst.begin (), lst.end (), c);
+}
+
+
+void radixSort (IntList & values) {
+    bool flag   = true;
+    int divisor = 1;
+    
+    while (flag)
+    {
+        DeqVector buckets (10);
+        flag = false;
+
+        std::for_each (values.begin (), values.end (), 
+            copyIntoBuckets (divisor, buckets, flag));
+        std::accumulate (buckets.begin (), buckets.end (), values.begin (), copyList);
+        divisor *= 10;
+        std::copy (values.begin (), values.end (), OstreamIter (std::cout, " "));
+        std::cout << std::endl;
+    }
+}
+
+
+int main () {
+    
+    std::cout << "Radix sort program"  << std::endl;
+
+    const IntList::value_type data[] = { 624, 852, 426, 987, 269,
+                                       146, 415, 301, 730, 78, 593 };
+
+    IntList values (data, data + sizeof data / sizeof *data);
+
+    radixSort (values);
+    std::copy (values.begin (), values.end (), OstreamIter (std::cout, " "));
+
+    std::cout << std::endl << "End radix sort program" << std::endl;
+
+    return 0;   
+}