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
18struct X1 {};
19struct X2 {};
20struct X3 {};
21struct X4 {};
22struct X5 {};
23
24int 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 using boost::mp11::mp_valid;
31
32 {
33 using L1 = mp_list<>;
34
35 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
36 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
37
38 using L2 = mp_list<X1, X2, X3, X4, X5>;
39
40 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, mp_list<X1, X2, X3, X4, X5>>));
41 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, mp_list<X2, X3, X4, X5>>));
42 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, mp_list<X3, X4, X5>>));
43 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, mp_list<X4, X5>>));
44 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, mp_list<X5>>));
45 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, mp_list<>>));
46
47 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, mp_list<X1, X2, X3, X4, X5>>));
48 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, mp_list<X2, X3, X4, X5>>));
49 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, mp_list<X3, X4, X5>>));
50 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, mp_list<X4, X5>>));
51 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, mp_list<X5>>));
52 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, mp_list<>>));
53 }
54
55 {
56 using L1 = std::tuple<>;
57
58 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
59 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
60
61 using L2 = std::tuple<X1, X2, X3, X4, X5>;
62
63 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 0>, std::tuple<X1, X2, X3, X4, X5>>));
64 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 1>, std::tuple<X2, X3, X4, X5>>));
65 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 2>, std::tuple<X3, X4, X5>>));
66 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 3>, std::tuple<X4, X5>>));
67 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 4>, std::tuple<X5>>));
68 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L2, 5>, std::tuple<>>));
69
70 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<0>>, std::tuple<X1, X2, X3, X4, X5>>));
71 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<1>>, std::tuple<X2, X3, X4, X5>>));
72 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<2>>, std::tuple<X3, X4, X5>>));
73 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<3>>, std::tuple<X4, X5>>));
74 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<4>>, std::tuple<X5>>));
75 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L2, mp_size_t<5>>, std::tuple<>>));
76 }
77
78 {
79 using L1 = std::pair<X1, X2>;
80
81 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop_c<L1, 0>, L1>));
82 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_drop<L1, mp_size_t<0>>, L1>));
83 }
84
85 {
86 BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<0>>));
87 BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<1>>));
88 BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<2>>));
89 BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<3>>));
90 BOOST_TEST_TRAIT_FALSE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<4>>));
91 BOOST_TEST_TRAIT_FALSE((mp_valid<mp_drop, mp_list<X1, X2, X3>, mp_size_t<5>>));
92 }
93
94 return boost::report_errors();
95}
96

source code of boost/libs/mp11/test/mp_drop.cpp