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

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+ /**************************************************************************
+ *
+ * adj_diff.cpp - Example program for adjacent_difference. 
+ *
+ * $Id: adj_diff.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 <numeric>       // for adjacent_difference
+#include <vector>        // for vector
+#include <iostream>      // for cout
+#include <iterator>      // for ostream_iterator
+#include <functional>    // for multiplies
+
+#include <examples.h>
+
+
+int main ()
+{
+    // Typedefs for convenience.
+    typedef std::vector<long, std::allocator<long> > Vector;
+
+    typedef std::ostream_iterator <Vector::value_type,
+                                   char,
+                                   std::char_traits<char> > os_iter;
+
+    // Initialize a Vector of ints from an array.
+    const Vector::value_type arr [] = {
+        1, 1, 2, 3, 5, 8, 13, 21, 34, 55
+    };
+
+    Vector v (arr + 0, arr + sizeof arr / sizeof *arr);
+
+    // Two vectors initialized to all zeros for storing results.
+    Vector diffs (v.size ()),
+           prods (v.size ());
+
+    // Calculate difference(s) using default operator (minus).
+    std::adjacent_difference (v.begin (), v.end (), diffs.begin ());
+
+    // Calculate difference (s) using the times operator.
+    std::adjacent_difference (v.begin (), v.end (), prods.begin (),
+                              std::multiplies<Vector::value_type> ());
+
+    // Create an ostream_iterator object (for convenience).
+    os_iter osit (std::cout, " ");
+
+    // Output the results.
+    std::cout << "For the vector: " << std::endl << "     ";
+    std::copy (v.begin (), v.end (), osit);
+
+    std::cout << std::endl << std::endl;
+
+    std::cout << "The differences between adjacent elements are: "
+              << std::endl << "    ";
+
+    std::copy (diffs.begin (), diffs.end (), osit);
+    std::cout << std::endl << std::endl;
+
+    std::cout << "The products of adjacent elements are: "
+              << std::endl << "     ";
+
+    std::copy (prods.begin (), prods.end (), osit);
+    std::cout << std::endl;
+
+    return 0;
+}