| // (C) Copyright Jeremy Siek 2000-2004. |
| // 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) |
| |
| |
| #include <boost/config.hpp> |
| #include <algorithm> |
| #include <iostream> |
| #include <iterator> |
| #include <vector> |
| #include <boost/iterator/counting_iterator.hpp> |
| #include <boost/iterator/indirect_iterator.hpp> |
| #include <boost/cstdlib.hpp> |
| |
| int main(int, char*[]) |
| { |
| // Example of using counting_iterator |
| std::cout << "counting from 0 to 4:" << std::endl; |
| boost::counting_iterator<int> first(0), last(4); |
| std::copy(first, last, std::ostream_iterator<int>(std::cout, " ")); |
| std::cout << std::endl; |
| |
| // Example of using counting iterator to create an array of pointers. |
| int N = 7; |
| std::vector<int> numbers; |
| typedef std::vector<int>::iterator n_iter; |
| // Fill "numbers" array with [0,N) |
| std::copy( |
| boost::counting_iterator<int>(0) |
| , boost::counting_iterator<int>(N) |
| , std::back_inserter(numbers)); |
| |
| std::vector<std::vector<int>::iterator> pointers; |
| |
| // Use counting iterator to fill in the array of pointers. |
| // causes an ICE with MSVC6 |
| std::copy(boost::make_counting_iterator(numbers.begin()), |
| boost::make_counting_iterator(numbers.end()), |
| std::back_inserter(pointers)); |
| |
| // Use indirect iterator to print out numbers by accessing |
| // them through the array of 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; |
| |
| return boost::exit_success; |
| } |