// (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; }