1 // (C) Copyright Jeremy Siek 2000-2004.
2 // Distributed under the Boost Software License, Version 1.0. (See
3 // accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
5
6
7 #include <boost/config.hpp>
8 #include <algorithm>
9 #include <iostream>
10 #include <iterator>
11 #include <vector>
12 #include <boost/iterator/counting_iterator.hpp>
13 #include <boost/iterator/indirect_iterator.hpp>
14 #include <boost/cstdlib.hpp>
15
main(int,char * [])16 int main(int, char*[])
17 {
18 // Example of using counting_iterator
19 std::cout << "counting from 0 to 4:" << std::endl;
20 boost::counting_iterator<int> first(0), last(4);
21 std::copy(first, last, std::ostream_iterator<int>(std::cout, " "));
22 std::cout << std::endl;
23
24 // Example of using counting iterator to create an array of pointers.
25 int N = 7;
26 std::vector<int> numbers;
27 typedef std::vector<int>::iterator n_iter;
28 // Fill "numbers" array with [0,N)
29 std::copy(
30 boost::counting_iterator<int>(0)
31 , boost::counting_iterator<int>(N)
32 , std::back_inserter(numbers));
33
34 std::vector<std::vector<int>::iterator> pointers;
35
36 // Use counting iterator to fill in the array of pointers.
37 // causes an ICE with MSVC6
38 std::copy(boost::make_counting_iterator(numbers.begin()),
39 boost::make_counting_iterator(numbers.end()),
40 std::back_inserter(pointers));
41
42 // Use indirect iterator to print out numbers by accessing
43 // them through the array of pointers.
44 std::cout << "indirectly printing out the numbers from 0 to "
45 << N << std::endl;
46 std::copy(boost::make_indirect_iterator(pointers.begin()),
47 boost::make_indirect_iterator(pointers.end()),
48 std::ostream_iterator<int>(std::cout, " "));
49 std::cout << std::endl;
50
51 return boost::exit_success;
52 }
53