// (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;

}