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/Src/Dependencies/Boost/libs/iterator/example/counting_iterator_example.cpp

http://hadesmem.googlecode.com/
C++ | 52 lines | 33 code | 8 blank | 11 comment | 0 complexity | e7a1db568e3ae7ba6a4b1aff18fb687c MD5 | raw file
 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
16int 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}