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

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+/**************************************************************************
+ *
+ * permute.cpp - Example program of permutations.
+ *
+ * $Id: permutation.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 <algorithm>  // for next_permutation, prev_permutation
+#include <functional> // for less
+#include <iostream>   // for cout, endl
+#include <iterator>   // for ostream_iterator
+#include <numeric>    // for accumulate
+#include <vector>     // for vector
+
+#include <examples.h>
+
+int main ()
+{
+    typedef std::vector<int, std::allocator<int> > IntVec;
+    typedef std::vector<char, std::allocator<char> > CharVec;
+
+    // Initialize a vector using an array of integers.
+    const IntVec::value_type  a1[] = { 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 };
+    const CharVec::value_type a2[] = "abcdefghji";
+
+    // Create the initial set and copies for permuting.
+    IntVec m1      (a1 + 0, a1 + sizeof a1 / sizeof *a1); 
+    IntVec prev_m1 (10);
+    IntVec next_m1 (10);
+
+    CharVec m2      (a2 + 0, a2 + sizeof a2 / sizeof *a2 - 1);
+    CharVec prev_m2 (10);
+    CharVec next_m2 (10);
+
+    std::copy (m1.begin (), m1.end (), prev_m1.begin ());
+    std::copy (m1.begin (), m1.end (), next_m1.begin ());
+    std::copy (m2.begin (), m2.end (), prev_m2.begin ());
+    std::copy (m2.begin (), m2.end (), next_m2.begin ());
+
+    // Create permutations.
+    typedef std::less<IntVec::value_type>  IntLess;
+    typedef std::less<CharVec::value_type> CharLess;
+
+    std::prev_permutation (prev_m1.begin (), prev_m1.end (), IntLess ());
+    std::next_permutation (next_m1.begin (), next_m1.end (), IntLess ());
+    std::prev_permutation (prev_m2.begin (), prev_m2.end (), CharLess ());
+    std::next_permutation (next_m2.begin (), next_m2.end (), CharLess ());
+
+    // Output results.
+
+    typedef std::ostream_iterator<IntVec::value_type, char,
+                                  std::char_traits<char> >
+        IntOSIter;
+
+    typedef std::ostream_iterator<CharVec::value_type, char,
+                                  std::char_traits<char> >
+        CharOSIter;
+
+    std::cout << "Example 1: \n     Original values:      ";
+    std::copy (m1.begin (), m1.end (), IntOSIter (std::cout, " "));
+
+    std::cout << "\n     Previous permutation: ";
+    std::copy (prev_m1.begin (), prev_m1.end (), IntOSIter (std::cout, " "));
+
+    std::cout << "\n     Next Permutation:     ";
+    std::copy (next_m1.begin (), next_m1.end (), IntOSIter (std::cout, " "));
+
+    std::cout << "\n\nExample 2: \n     Original values:      ";
+    std::copy (m2.begin (), m2.end (), CharOSIter (std::cout, " "));     
+
+    std::cout << "\n     Previous Permutation: ";
+    std::copy (prev_m2.begin (), prev_m2.end (), CharOSIter (std::cout, " "));
+
+    std::cout << "\n     Next Permutation:     ";
+    std::copy (next_m2.begin (), next_m2.end (), CharOSIter (std::cout, " "));  
+
+    std::cout << std::endl << std::endl;
+
+    return 0;
+}