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
17 struct X1 {};
18 struct X2 {};
19 struct X3 {};
20 struct X4 {};
21
22 template<class T1, class T2> struct F {};
23
24 using boost::mp11::mp_plus;
25
main()26 int main()
27 {
28 using boost::mp11::mp_list;
29 using boost::mp11::mp_fold;
30
31 {
32 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<>, void, F>, void>));
33 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1>, void, F>, F<void, X1>>));
34 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2>, void, F>, F<F<void, X1>, X2>>));
35 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
36 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<mp_list<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
37 }
38
39 {
40 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<>, void, F>, void>));
41 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1>, void, F>, F<void, X1>>));
42 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2>, void, F>, F<F<void, X1>, X2>>));
43 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3>, void, F>, F<F<F<void, X1>, X2>, X3>>));
44 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
45 }
46
47 using boost::mp11::mp_push_back;
48
49 {
50 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_back>, mp_list<X1, X2, X3, X4>>));
51 }
52
53 using boost::mp11::mp_push_front;
54
55 {
56 BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, mp_push_front>, mp_list<X4, X3, X2, X1>>));
57 }
58
59 using boost::mp11::mp_iota_c;
60 using boost::mp11::mp_reverse;
61 using boost::mp11::mp_size_t;
62
63 {
64 int const N = 37;
65
66 using L = mp_iota_c<N>;
67
68 using R1 = mp_fold<L, mp_list<>, mp_push_back>;
69 BOOST_TEST_TRAIT_TRUE((std::is_same<R1, L>));
70
71 using R2 = mp_fold<L, mp_list<>, mp_push_front>;
72 BOOST_TEST_TRAIT_TRUE((std::is_same<R2, mp_reverse<L>>));
73
74 using R3 = mp_fold<L, mp_size_t<0>, mp_plus>;
75 BOOST_TEST_TRAIT_TRUE((std::is_same<R3, mp_size_t<N*(N-1)/2>>));
76 }
77
78 return boost::report_errors();
79 }
80