| .. Copyright David Abrahams 2006. Distributed under the Boost |
| .. Software License, Version 1.0. (See accompanying |
| .. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| Example |
| ....... |
| |
| This example fills an array with numbers and a second array with |
| pointers into the first array, using ``counting_iterator`` for both |
| tasks. Finally ``indirect_iterator`` is used to print out the numbers |
| into the first array via indirection through the second array. |
| |
| :: |
| |
| int N = 7; |
| std::vector<int> numbers; |
| typedef std::vector<int>::iterator n_iter; |
| std::copy(boost::counting_iterator<int>(0), |
| boost::counting_iterator<int>(N), |
| std::back_inserter(numbers)); |
| |
| std::vector<std::vector<int>::iterator> pointers; |
| std::copy(boost::make_counting_iterator(numbers.begin()), |
| boost::make_counting_iterator(numbers.end()), |
| std::back_inserter(pointers)); |
| |
| std::cout << "indirectly printing out the numbers from 0 to " |
| << N << std::endl; |
| std::copy(boost::make_indirect_iterator(pointers.begin()), |
| boost::make_indirect_iterator(pointers.end()), |
| std::ostream_iterator<int>(std::cout, " ")); |
| std::cout << std::endl; |
| |
| |
| The output is:: |
| |
| indirectly printing out the numbers from 0 to 7 |
| 0 1 2 3 4 5 6 |
| |
| The source code for this example can be found `here`__. |
| |
| __ ../example/counting_iterator_example.cpp |
| |