1 /*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2011 Eric Niebler
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 ==============================================================================*/
8 #include <boost/detail/lightweight_test.hpp>
9 #include <boost/fusion/sequence/io/out.hpp>
10 #include <boost/fusion/view/single_view/single_view.hpp>
11 #include <boost/fusion/sequence/intrinsic/at.hpp>
12 #include <boost/fusion/sequence/intrinsic/begin.hpp>
13 #include <boost/fusion/sequence/intrinsic/end.hpp>
14 #include <boost/fusion/sequence/intrinsic/size.hpp>
15 #include <boost/fusion/sequence/intrinsic/front.hpp>
16 #include <boost/fusion/sequence/intrinsic/back.hpp>
17 #include <boost/fusion/sequence/intrinsic/empty.hpp>
18 #include <boost/fusion/sequence/intrinsic/value_at.hpp>
19 #include <boost/fusion/iterator/next.hpp>
20 #include <boost/fusion/iterator/prior.hpp>
21 #include <boost/fusion/iterator/deref.hpp>
22 #include <boost/fusion/iterator/advance.hpp>
23 #include <boost/fusion/iterator/distance.hpp>
24 #include <boost/mpl/int.hpp>
25 #include <boost/mpl/assert.hpp>
26 #include <boost/type_traits/is_same.hpp>
27
28 struct X {};
29
30 template <typename OS>
operator <<(OS & os,X const &)31 OS& operator<<(OS& os, X const&)
32 {
33 os << "<X-object>";
34 return os;
35 }
36
foo()37 void foo() {}
38
39 int
main()40 main()
41 {
42 using namespace boost::fusion;
43
44 std::cout << tuple_open('[');
45 std::cout << tuple_close(']');
46 std::cout << tuple_delimiter(", ");
47
48 {
49 single_view<int> view1(3);
50 std::cout << view1 << std::endl;
51
52 #ifdef FUSION_TEST_FAIL
53 // single_view is immutable
54 *begin(view1) += 4;
55 #endif
56 std::cout << view1 << std::endl;
57 BOOST_TEST(*begin(view1) == 3);
58 BOOST_TEST(at<boost::mpl::int_<0> >(view1) == 3);
59 BOOST_TEST(view1.val == 3);
60 BOOST_TEST(3 == front(view1));
61 BOOST_TEST(3 == back(view1));
62 BOOST_TEST(!empty(view1));
63 BOOST_TEST(next(begin(view1)) == end(view1));
64 BOOST_TEST(prior(end(view1)) == begin(view1));
65 BOOST_TEST(!(next(begin(view1)) != end(view1)));
66 BOOST_TEST(!(prior(end(view1)) != begin(view1)));
67 BOOST_TEST(1 == distance(begin(view1), end(view1)));
68 BOOST_TEST(0 == distance(end(view1), end(view1)));
69 BOOST_TEST(0 == distance(begin(view1), begin(view1)));
70 BOOST_TEST(end(view1) == advance<boost::mpl::int_<1> >(begin(view1)));
71 BOOST_TEST(begin(view1) == advance<boost::mpl::int_<0> >(begin(view1)));
72 BOOST_TEST(end(view1) == advance<boost::mpl::int_<0> >(end(view1)));
73 BOOST_TEST(begin(view1) == advance<boost::mpl::int_<-1> >(end(view1)));
74 BOOST_TEST(end(view1) == advance_c<1>(begin(view1)));
75 BOOST_TEST(begin(view1) == advance_c<0>(begin(view1)));
76 BOOST_TEST(end(view1) == advance_c<0>(end(view1)));
77 BOOST_TEST(begin(view1) == advance_c<-1>(end(view1)));
78 BOOST_TEST(1 == size(view1));
79 BOOST_MPL_ASSERT((boost::is_same<int, boost::fusion::result_of::value_at<single_view<int>, boost::mpl::int_<0> >::type>));
80
81 single_view<X> view2;
82 std::cout << view2 << std::endl;
83 }
84
85 {
86 std::cout << make_single_view(1) << std::endl;
87 std::cout << make_single_view("Hello, World") << std::endl;
88 std::cout << make_single_view(&foo) << std::endl;
89 }
90
91 return boost::report_errors();
92 }
93
94