1 | // Copyright 2017 Peter Dimov. |
2 | // Distributed under the Boost Software License, Version 1.0. |
3 | |
4 | #include <boost/tuple/tuple.hpp> |
5 | #include <boost/core/lightweight_test_trait.hpp> |
6 | #include <boost/type_traits/is_same.hpp> |
7 | #include <boost/config.hpp> |
8 | #include <boost/config/pragma_message.hpp> |
9 | |
10 | #if defined(BOOST_NO_CXX11_HDR_TUPLE) |
11 | |
12 | BOOST_PRAGMA_MESSAGE("Skipping std::tuple_element tests for lack of <tuple>" ) |
13 | int main() {} |
14 | |
15 | #else |
16 | |
17 | #include <tuple> |
18 | |
19 | template<class Tp, std::size_t I, class E> void test() |
20 | { |
21 | BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp>::type, E>)); |
22 | |
23 | typedef typename Tp::inherited Tp2; |
24 | BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp2>::type, E>)); |
25 | } |
26 | |
27 | template<int> struct X |
28 | { |
29 | }; |
30 | |
31 | int main() |
32 | { |
33 | test<boost::tuple<X<0> const>, 0, X<0> const>(); |
34 | |
35 | test<boost::tuple<X<0> const, X<1> const>, 0, X<0> const>(); |
36 | test<boost::tuple<X<0> const, X<1> const>, 1, X<1> const>(); |
37 | |
38 | test<boost::tuple<X<0> const, X<1> const, X<2> const>, 0, X<0> const>(); |
39 | test<boost::tuple<X<0> const, X<1> const, X<2> const>, 1, X<1> const>(); |
40 | test<boost::tuple<X<0> const, X<1> const, X<2> const>, 2, X<2> const>(); |
41 | |
42 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 0, X<0> const>(); |
43 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 1, X<1> const>(); |
44 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 2, X<2> const>(); |
45 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 3, X<3> const>(); |
46 | |
47 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 0, X<0> const>(); |
48 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 1, X<1> const>(); |
49 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 2, X<2> const>(); |
50 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 3, X<3> const>(); |
51 | test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 4, X<4> const>(); |
52 | |
53 | return boost::report_errors(); |
54 | } |
55 | |
56 | #endif |
57 | |