1.. Copyright David Abrahams 2006. Distributed under the Boost 2.. Software License, Version 1.0. (See accompanying 3.. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 4 5Example 6....... 7 8This is a simple example of using the transform_iterators class to 9generate iterators that multiply (or add to) the value returned by 10dereferencing the iterator. It would be cooler to use lambda library 11in this example. 12 13:: 14 15 int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 }; 16 const int N = sizeof(x)/sizeof(int); 17 18 typedef boost::binder1st< std::multiplies<int> > Function; 19 typedef boost::transform_iterator<Function, int*> doubling_iterator; 20 21 doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)), 22 i_end(x + N, boost::bind1st(std::multiplies<int>(), 2)); 23 24 std::cout << "multiplying the array by 2:" << std::endl; 25 while (i != i_end) 26 std::cout << *i++ << " "; 27 std::cout << std::endl; 28 29 std::cout << "adding 4 to each element in the array:" << std::endl; 30 std::copy(boost::make_transform_iterator(x, boost::bind1st(std::plus<int>(), 4)), 31 boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)), 32 std::ostream_iterator<int>(std::cout, " ")); 33 std::cout << std::endl; 34 35 36The output is:: 37 38 multiplying the array by 2: 39 2 4 6 8 10 12 14 16 40 adding 4 to each element in the array: 41 5 6 7 8 9 10 11 12 42 43 44The source code for this example can be found `here`__. 45 46__ ../example/transform_iterator_example.cpp 47