1
2 // Copyright 2015 Peter Dimov.
3 //
4 // Distributed under the Boost Software License, Version 1.0.
5 //
6 // See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt
8
9
10 #include <boost/mp11/algorithm.hpp>
11 #include <boost/mp11/list.hpp>
12 #include <boost/mp11/integral.hpp>
13 #include <boost/core/lightweight_test_trait.hpp>
14 #include <type_traits>
15 #include <tuple>
16 #include <utility>
17
18 struct X1 {};
19 struct X2 {};
20 struct X3 {};
21 struct X4 {};
22 struct X5 {};
23
main()24 int main()
25 {
26 using boost::mp11::mp_list;
27 using boost::mp11::mp_drop;
28 using boost::mp11::mp_drop_c;
29 using boost::mp11::mp_size_t;
30
31 {
32 using L1 = mp_list<>;
33
34 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
35 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
36
37 using L2 = mp_list<X1, X2, X3, X4, X5>;
38
39 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, mp_list<X1, X2, X3, X4, X5>>));
40 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, mp_list<X2, X3, X4, X5>>));
41 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, mp_list<X3, X4, X5>>));
42 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, mp_list<X4, X5>>));
43 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, mp_list<X5>>));
44 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, mp_list<>>));
45
46 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, mp_list<X1, X2, X3, X4, X5>>));
47 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, mp_list<X2, X3, X4, X5>>));
48 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, mp_list<X3, X4, X5>>));
49 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, mp_list<X4, X5>>));
50 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, mp_list<X5>>));
51 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, mp_list<>>));
52 }
53
54 {
55 using L1 = std::tuple<>;
56
57 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
58 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
59
60 using L2 = std::tuple<X1, X2, X3, X4, X5>;
61
62 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, std::tuple<X1, X2, X3, X4, X5>>));
63 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, std::tuple<X2, X3, X4, X5>>));
64 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, std::tuple<X3, X4, X5>>));
65 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, std::tuple<X4, X5>>));
66 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, std::tuple<X5>>));
67 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, std::tuple<>>));
68
69 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, std::tuple<X1, X2, X3, X4, X5>>));
70 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, std::tuple<X2, X3, X4, X5>>));
71 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, std::tuple<X3, X4, X5>>));
72 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, std::tuple<X4, X5>>));
73 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, std::tuple<X5>>));
74 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, std::tuple<>>));
75 }
76
77 {
78 using L1 = std::pair<X1, X2>;
79
80 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
81 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
82 }
83
84 return boost::report_errors();
85 }
86