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

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+/**************************************************************************
+ *
+ * inr_prod.cpp - Example program computes the inner product A X B of two
+ *                ranges A and B.
+ *
+ * $Id: inner_product.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 copy()
+#include <functional>    // for plus, minus
+#include <iostream>      // for cout, endl
+#include <iterator>      // for ostream_iterator
+#include <list>          // for list
+#include <numeric>       // for inner_product()
+#include <vector>        // for vector
+
+#include <examples.h>
+
+
+int main ()
+{
+    typedef std::list<int, std::allocator<int> >                      List;
+    typedef std::vector<int, std::allocator<int> >                    Vector;
+    typedef std::ostream_iterator<int, char, std::char_traits<char> > os_iter;
+
+    // Initialize a list and a vector using arrays of ints.
+    int a1[] = { 6, -3, -2 };
+    int a2[] = { -2, -3, -2 };
+
+    List   l (a1, a1 + sizeof a1 / sizeof *a1);
+    Vector v (a2, a2 + sizeof a2 / sizeof *a2);
+
+    // Calculate the inner product of the two sets of values.
+    List::value_type prod = std::inner_product (l.begin (), l.end (),
+                                                v.begin (), 0);
+
+    // Calculate a wacky inner product using the same values.
+    List::value_type wacky =
+        std::inner_product (l.begin (), l.end (), v.begin (), 0, 
+                            std::plus<List::value_type>(),
+                            std::minus<List::value_type>());
+    // Print the output.
+    std::cout << "For the sets of numbers: { ";
+    std::copy (v.begin (), v.end (), os_iter (std::cout, " "));
+
+    std::cout << "} and { ";
+    std::copy (l.begin (), l.end (), os_iter (std::cout, " "));
+
+    std::cout << "}\nThe inner product is: " << prod
+              << "\nThe wacky result is:  " << wacky
+              << std::endl;
+
+    return 0;
+}