1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14
10
11 // <variant>
12
13 // template <size_t I, class... Types>
14 // constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>>
15 // get_if(variant<Types...>* v) noexcept;
16 // template <size_t I, class... Types>
17 // constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>>
18 // get_if(const variant<Types...>* v) noexcept;
19
20 #include "test_macros.h"
21 #include "variant_test_helpers.h"
22 #include <cassert>
23 #include <memory>
24 #include <variant>
25
test_const_get_if()26 void test_const_get_if() {
27 {
28 using V = std::variant<int>;
29 constexpr const V *v = nullptr;
30 static_assert(std::get_if<0>(v) == nullptr, "");
31 }
32 {
33 using V = std::variant<int, const long>;
34 constexpr V v(42);
35 ASSERT_NOEXCEPT(std::get_if<0>(&v));
36 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
37 static_assert(*std::get_if<0>(&v) == 42, "");
38 static_assert(std::get_if<1>(&v) == nullptr, "");
39 }
40 {
41 using V = std::variant<int, const long>;
42 constexpr V v(42l);
43 ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
44 static_assert(*std::get_if<1>(&v) == 42, "");
45 static_assert(std::get_if<0>(&v) == nullptr, "");
46 }
47 // FIXME: Remove these once reference support is reinstated
48 #if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
49 {
50 using V = std::variant<int &>;
51 int x = 42;
52 const V v(x);
53 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
54 assert(std::get_if<0>(&v) == &x);
55 }
56 {
57 using V = std::variant<int &&>;
58 int x = 42;
59 const V v(std::move(x));
60 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
61 assert(std::get_if<0>(&v) == &x);
62 }
63 {
64 using V = std::variant<const int &&>;
65 int x = 42;
66 const V v(std::move(x));
67 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
68 assert(std::get_if<0>(&v) == &x);
69 }
70 #endif
71 }
72
test_get_if()73 void test_get_if() {
74 {
75 using V = std::variant<int>;
76 V *v = nullptr;
77 assert(std::get_if<0>(v) == nullptr);
78 }
79 {
80 using V = std::variant<int, long>;
81 V v(42);
82 ASSERT_NOEXCEPT(std::get_if<0>(&v));
83 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
84 assert(*std::get_if<0>(&v) == 42);
85 assert(std::get_if<1>(&v) == nullptr);
86 }
87 {
88 using V = std::variant<int, const long>;
89 V v(42l);
90 ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
91 assert(*std::get_if<1>(&v) == 42);
92 assert(std::get_if<0>(&v) == nullptr);
93 }
94 // FIXME: Remove these once reference support is reinstated
95 #if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
96 {
97 using V = std::variant<int &>;
98 int x = 42;
99 V v(x);
100 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
101 assert(std::get_if<0>(&v) == &x);
102 }
103 {
104 using V = std::variant<const int &>;
105 int x = 42;
106 V v(x);
107 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
108 assert(std::get_if<0>(&v) == &x);
109 }
110 {
111 using V = std::variant<int &&>;
112 int x = 42;
113 V v(std::move(x));
114 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
115 assert(std::get_if<0>(&v) == &x);
116 }
117 {
118 using V = std::variant<const int &&>;
119 int x = 42;
120 V v(std::move(x));
121 ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
122 assert(std::get_if<0>(&v) == &x);
123 }
124 #endif
125 }
126
main(int,char **)127 int main(int, char**) {
128 test_const_get_if();
129 test_get_if();
130
131 return 0;
132 }
133