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 // <optional>
11
12 // template <class U>
13 // explicit optional(optional<U>&& rhs);
14
15 #include <optional>
16 #include <type_traits>
17 #include <cassert>
18
19 #include "test_macros.h"
20
21 using std::optional;
22
23 template <class T, class U>
test(optional<U> && rhs,bool is_going_to_throw=false)24 TEST_CONSTEXPR_CXX20 void test(optional<U>&& rhs, bool is_going_to_throw = false)
25 {
26 static_assert(!(std::is_convertible<optional<U>&&, optional<T>>::value), "");
27 bool rhs_engaged = static_cast<bool>(rhs);
28 #ifndef TEST_HAS_NO_EXCEPTIONS
29 try
30 {
31 optional<T> lhs(std::move(rhs));
32 assert(is_going_to_throw == false);
33 assert(static_cast<bool>(lhs) == rhs_engaged);
34 }
35 catch (int i)
36 {
37 assert(i == 6);
38 }
39 #else
40 if (is_going_to_throw) return;
41 optional<T> lhs(std::move(rhs));
42 assert(static_cast<bool>(lhs) == rhs_engaged);
43 #endif
44 }
45
46 class X
47 {
48 int i_;
49 public:
X(int i)50 constexpr explicit X(int i) : i_(i) {}
X(X && x)51 constexpr X(X&& x) : i_(x.i_) { x.i_ = 0; }
~X()52 TEST_CONSTEXPR_CXX20 ~X() {i_ = 0;}
operator ==(const X & x,const X & y)53 friend constexpr bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
54 };
55
56 int count = 0;
57
58 class Z
59 {
60 public:
Z(int)61 explicit Z(int) { TEST_THROW(6); }
62 };
63
test()64 TEST_CONSTEXPR_CXX20 bool test()
65 {
66 {
67 optional<int> rhs;
68 test<X>(std::move(rhs));
69 }
70 {
71 optional<int> rhs(3);
72 test<X>(std::move(rhs));
73 }
74
75 return true;
76 }
77
main(int,char **)78 int main(int, char**)
79 {
80 #if TEST_STD_VER > 17
81 static_assert(test());
82 #endif
83 test();
84 {
85 optional<int> rhs;
86 test<Z>(std::move(rhs));
87 }
88 {
89 optional<int> rhs(3);
90 test<Z>(std::move(rhs), true);
91 }
92
93 return 0;
94 }
95