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(const 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>
24 TEST_CONSTEXPR_CXX20 void
test(const optional<U> & rhs,bool is_going_to_throw=false)25 test(const optional<U>& rhs, bool is_going_to_throw = false)
26 {
27 static_assert(!(std::is_convertible<const optional<U>&, optional<T>>::value), "");
28 bool rhs_engaged = static_cast<bool>(rhs);
29 #ifndef TEST_HAS_NO_EXCEPTIONS
30 try
31 {
32 optional<T> lhs(rhs);
33 assert(is_going_to_throw == false);
34 assert(static_cast<bool>(lhs) == rhs_engaged);
35 if (rhs_engaged)
36 assert(*lhs == T(*rhs));
37 }
38 catch (int i)
39 {
40 assert(i == 6);
41 }
42 #else
43 if (is_going_to_throw) return;
44 optional<T> lhs(rhs);
45 assert(static_cast<bool>(lhs) == rhs_engaged);
46 if (rhs_engaged)
47 assert(*lhs == T(*rhs));
48 #endif
49 }
50
51 class X
52 {
53 int i_;
54 public:
X(int i)55 constexpr explicit X(int i) : i_(i) {}
X(const X & x)56 constexpr X(const X& x) : i_(x.i_) {}
~X()57 TEST_CONSTEXPR_CXX20 ~X() {i_ = 0;}
operator ==(const X & x,const X & y)58 friend constexpr bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
59 };
60
61 class Y
62 {
63 int i_;
64 public:
Y(int i)65 constexpr explicit Y(int i) : i_(i) {}
66
operator ==(const Y & x,const Y & y)67 friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
68 };
69
70 int count = 0;
71
72 class Z
73 {
74 int i_;
75 public:
Z(int i)76 explicit Z(int i) : i_(i) {TEST_THROW(6);}
77
operator ==(const Z & x,const Z & y)78 friend bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;}
79 };
80
81 template<class T, class U>
test_all()82 constexpr bool test_all()
83 {
84 {
85 optional<U> rhs;
86 test<T>(rhs);
87 }
88 {
89 optional<U> rhs(3);
90 test<T>(rhs);
91 }
92 return true;
93 }
94
95
main(int,char **)96 int main(int, char**)
97 {
98 test_all<X, int>();
99 test_all<Y, int>();
100 #if TEST_STD_VER > 17
101 static_assert(test_all<X, int>());
102 static_assert(test_all<Y, int>());
103 #endif
104 {
105 typedef Z T;
106 typedef int U;
107 optional<U> rhs;
108 test<T>(rhs);
109 }
110 {
111 typedef Z T;
112 typedef int U;
113 optional<U> rhs(3);
114 test<T>(rhs, true);
115 }
116
117 return 0;
118 }
119