]>
Commit | Line | Data |
---|---|---|
b32b8144 FG |
1 | // Copyright Louis Dionne 2013-2016 |
2 | // Distributed under the Boost Software License, Version 1.0. | |
3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
4 | ||
5 | #include <boost/hana/detail/ebo.hpp> | |
6 | ||
7 | #include <boost/hana/assert.hpp> | |
8 | ||
9 | #include <string> | |
10 | #include <type_traits> | |
11 | #include <utility> | |
12 | namespace hana = boost::hana; | |
13 | using hana::detail::ebo; | |
14 | ||
15 | ||
16 | template <int> struct empty { }; | |
17 | template <int> struct idx; | |
92f5a8d4 TL |
18 | #ifdef BOOST_HANA_WORKAROUND_MSVC_EMPTYBASE |
19 | template <typename ...Bases> struct __declspec(empty_bases) inherit : Bases... { }; | |
20 | #else | |
b32b8144 | 21 | template <typename ...Bases> struct inherit : Bases... { }; |
92f5a8d4 | 22 | #endif |
b32b8144 FG |
23 | |
24 | static_assert(sizeof(inherit<>) == sizeof(inherit<ebo<idx<0>, empty<0>>>), ""); | |
25 | static_assert(sizeof(inherit<>) == sizeof(inherit<ebo<idx<0>, empty<0>>, ebo<idx<1>, empty<1>>>), ""); | |
26 | static_assert(sizeof(inherit<>) == sizeof(inherit<ebo<idx<0>, empty<0>>, ebo<idx<1>, empty<1>>, ebo<idx<2>, empty<2>>>), ""); | |
27 | ||
28 | ||
29 | int main() { | |
30 | // Test default-construction | |
31 | { | |
32 | constexpr ebo<idx<0>, int> e; | |
33 | static_assert(hana::detail::ebo_get<idx<0>>(e) == 0, ""); | |
34 | } | |
35 | ||
36 | // Test construction of a non-empty object | |
37 | { | |
38 | ebo<idx<0>, std::string> e{"foobar"}; | |
39 | BOOST_HANA_RUNTIME_CHECK(hana::detail::ebo_get<idx<0>>(e) == "foobar"); | |
40 | } | |
41 | ||
42 | { | |
43 | ebo<idx<0>, std::string> e{}; | |
44 | BOOST_HANA_RUNTIME_CHECK(hana::detail::ebo_get<idx<0>>(e) == ""); | |
45 | } | |
46 | ||
47 | // Test construction of a non default-constructible type | |
48 | { | |
49 | struct nodefault { | |
50 | nodefault() = delete; | |
51 | explicit nodefault(char const*) { } | |
52 | }; | |
53 | ebo<idx<0>, nodefault> e{"foobar"}; | |
54 | } | |
55 | ||
56 | // Get lvalue, const lvalue and rvalue with a non-empty type | |
57 | { | |
58 | ebo<idx<0>, std::string> e{"foobar"}; | |
59 | std::string& s = hana::detail::ebo_get<idx<0>>(e); | |
60 | BOOST_HANA_RUNTIME_CHECK(s == "foobar"); | |
61 | s = "foobaz"; | |
62 | BOOST_HANA_RUNTIME_CHECK(hana::detail::ebo_get<idx<0>>(e) == "foobaz"); | |
63 | } | |
64 | ||
65 | { | |
66 | ebo<idx<0>, std::string> const e{"foobar"}; | |
67 | std::string const& s = hana::detail::ebo_get<idx<0>>(e); | |
68 | BOOST_HANA_RUNTIME_CHECK(s == "foobar"); | |
69 | } | |
70 | ||
71 | { | |
72 | ebo<idx<0>, std::string> e{"foobar"}; | |
73 | std::string&& s = hana::detail::ebo_get<idx<0>>(std::move(e)); | |
74 | BOOST_HANA_RUNTIME_CHECK(s == "foobar"); | |
75 | } | |
76 | ||
77 | // Get lvalue, const lvalue and rvalue with an empty type | |
78 | { | |
79 | ebo<idx<0>, empty<0>> e{}; | |
80 | empty<0>& s = hana::detail::ebo_get<idx<0>>(e); | |
81 | (void)s; | |
82 | } | |
83 | ||
84 | { | |
85 | ebo<idx<0>, empty<0>> const e{}; | |
86 | empty<0> const& s = hana::detail::ebo_get<idx<0>>(e); | |
87 | (void)s; | |
88 | } | |
89 | ||
90 | { | |
91 | ebo<idx<0>, empty<0>> e{}; | |
92 | empty<0>&& s = hana::detail::ebo_get<idx<0>>(std::move(e)); | |
93 | (void)s; | |
94 | } | |
95 | } |