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
27namespace
28{
29
30template<class Iterator1, class Iterator2>
31void 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
51template<class SinglePassRange1, class SinglePassRange2>
52void 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//<-
63void 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 test_rng: input | indexed(0),
91 reference_rng: input);
92}
93}
94
95boost::unit_test::test_suite*
96init_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

source code of boost/libs/range/test/adaptor_test/indexed_example.cpp