1 // Boost.Range library
2 //
3 // Copyright Neil Groves 2009. Use, modification and
4 // distribution is subject to the Boost Software License, Version
5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
7 //
8 //
9 // For more information, see http://www.boost.org/libs/range/
10 //
11 //[indexed_example
12
13 //<-
14 #include <boost/config.hpp>
15 //->
16
17 #include <boost/range/adaptor/indexed.hpp>
18 #include <boost/assign.hpp>
19 #include <iterator>
20 #include <iostream>
21 #include <vector>
22
23 //<-
24 #include <boost/test/test_tools.hpp>
25 #include <boost/test/unit_test.hpp>
26
27 namespace
28 {
29
30 template<class Iterator1, class Iterator2>
check_element_and_index(Iterator1 test_first,Iterator1 test_last,Iterator2 reference_first,Iterator2 reference_last)31 void check_element_and_index(
32 Iterator1 test_first,
33 Iterator1 test_last,
34 Iterator2 reference_first,
35 Iterator2 reference_last)
36 {
37 BOOST_CHECK_EQUAL( std::distance(test_first, test_last),
38 std::distance(reference_first, reference_last) );
39
40 std::ptrdiff_t reference_index = 0;
41
42 Iterator1 test_it = test_first;
43 Iterator2 reference_it = reference_first;
44 for (; test_it != test_last; ++test_it, ++reference_it, ++reference_index)
45 {
46 BOOST_CHECK_EQUAL(test_it->value(), *reference_it);
47 BOOST_CHECK_EQUAL(test_it->index(), reference_index);
48 }
49 }
50
51 template<class SinglePassRange1, class SinglePassRange2>
check_element_and_index(const SinglePassRange1 & test_rng,const SinglePassRange2 & reference_rng)52 void check_element_and_index(
53 const SinglePassRange1& test_rng,
54 const SinglePassRange2& reference_rng)
55 {
56 check_element_and_index(
57 boost::begin(test_rng), boost::end(test_rng),
58 boost::begin(reference_rng), boost::end(reference_rng));
59 }
60 //->
61
62 //<-
indexed_example_test()63 void indexed_example_test()
64 //->
65 //=int main(int argc, const char* argv[])
66 {
67 using namespace boost::assign;
68 using namespace boost::adaptors;
69
70 std::vector<int> input;
71 input += 10,20,30,40,50,60,70,80,90;
72
73 //<-
74 #ifndef BOOST_NO_CXX11_RANGE_BASED_FOR
75 //->
76 for (const auto& element : input | indexed(0))
77 {
78 std::cout << "Element = " << element.value()
79 << " Index = " << element.index()
80 << std::endl;
81 }
82 //<-
83 #endif // C++11 has range for loop
84 //->
85
86 //= return 0;
87 //=}
88 //]
89 check_element_and_index(
90 input | indexed(0),
91 input);
92 }
93 }
94
95 boost::unit_test::test_suite*
init_unit_test_suite(int argc,char * argv[])96 init_unit_test_suite(int argc, char* argv[])
97 {
98 boost::unit_test::test_suite* test
99 = BOOST_TEST_SUITE( "RangeTestSuite.adaptor.indexed_example" );
100
101 test->add( BOOST_TEST_CASE( &indexed_example_test ) );
102
103 return test;
104 }
105