1 // Copyright (C) 2017 Michel Morin.
2 //
3 // Distributed under the Boost Software License, Version 1.0.
4 // (See accompanying file LICENSE_1_0.txt or copy at
5 // http://www.boost.org/LICENSE_1_0.txt)
6
7 #include <vector>
8 #include <list>
9 #include <boost/container/slist.hpp>
10 #include <boost/core/lightweight_test.hpp>
11 #include <boost/iterator/distance.hpp>
12 #include <boost/iterator/transform_iterator.hpp>
13
twice(int x)14 int twice(int x) { return x + x; }
15
16 template <typename Iterator>
test_distance(Iterator it_from,Iterator it_to,int n)17 void test_distance(Iterator it_from, Iterator it_to, int n)
18 {
19 BOOST_TEST(boost::distance(it_from, it_to) == n);
20 }
21
main()22 int main()
23 {
24 int array[3] = {1, 2, 3};
25 int* ptr1 = array;
26 int* ptr2 = array + 3;
27
28 {
29 test_distance(ptr1, ptr2, 3);
30 test_distance(ptr2, ptr1, -3);
31
32 test_distance(
33 boost::make_transform_iterator(ptr1, twice)
34 , boost::make_transform_iterator(ptr2, twice)
35 , 3
36 );
37 test_distance(
38 boost::make_transform_iterator(ptr2, twice)
39 , boost::make_transform_iterator(ptr1, twice)
40 , -3
41 );
42 }
43
44 {
45 std::vector<int> ints(ptr1, ptr2);
46 test_distance(ints.begin(), ints.end(), 3);
47 test_distance(ints.end(), ints.begin(), -3);
48
49 test_distance(
50 boost::make_transform_iterator(ints.begin(), twice)
51 , boost::make_transform_iterator(ints.end(), twice)
52 , 3
53 );
54 test_distance(
55 boost::make_transform_iterator(ints.end(), twice)
56 , boost::make_transform_iterator(ints.begin(), twice)
57 , -3
58 );
59 }
60
61 {
62 std::list<int> ints(ptr1, ptr2);
63 test_distance(ints.begin(), ints.end(), 3);
64
65 test_distance(
66 boost::make_transform_iterator(ints.begin(), twice)
67 , boost::make_transform_iterator(ints.end(), twice)
68 , 3
69 );
70 }
71
72 {
73 boost::container::slist<int> ints(ptr1, ptr2);
74 test_distance(ints.begin(), ints.end(), 3);
75
76 test_distance(
77 boost::make_transform_iterator(ints.begin(), twice)
78 , boost::make_transform_iterator(ints.end(), twice)
79 , 3
80 );
81 }
82
83 return boost::report_errors();
84 }
85