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// optional(const optional<U>& rhs);
14
15#include <optional>
16#include <type_traits>
17#include <cassert>
18
19#include "test_macros.h"
20
21using std::optional;
22
23template <class T, class U>
24TEST_CONSTEXPR_CXX20 void
25test(const optional<U>& rhs, bool is_going_to_throw = false)
26{
27 bool rhs_engaged = static_cast<bool>(rhs);
28#ifndef TEST_HAS_NO_EXCEPTIONS
29 try
30 {
31 optional<T> lhs = rhs;
32 assert(is_going_to_throw == false);
33 assert(static_cast<bool>(lhs) == rhs_engaged);
34 if (rhs_engaged)
35 assert(*lhs == *rhs);
36 }
37 catch (int i)
38 {
39 assert(i == 6);
40 }
41#else
42 if (is_going_to_throw) return;
43 optional<T> lhs = rhs;
44 assert(static_cast<bool>(lhs) == rhs_engaged);
45 if (rhs_engaged)
46 assert(*lhs == *rhs);
47#endif
48}
49
50class X
51{
52 int i_;
53public:
54 constexpr X(int i) : i_(i) {}
55 constexpr X(const X& x) : i_(x.i_) {}
56 TEST_CONSTEXPR_CXX20 ~X() {i_ = 0;}
57 friend constexpr bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
58};
59
60class Y
61{
62 int i_;
63public:
64 constexpr Y(int i) : i_(i) {}
65
66 friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
67};
68
69int count = 0;
70
71class Z
72{
73 int i_;
74public:
75 Z(int i) : i_(i) {TEST_THROW(6);}
76
77 friend bool operator==(const Z& x, const Z& y) {return x.i_ == y.i_;}
78};
79
80template<class T, class U>
81constexpr bool test_all()
82{
83 {
84 optional<U> rhs;
85 test<T>(rhs);
86 }
87 {
88 optional<U> rhs(U{3});
89 test<T>(rhs);
90 }
91 return true;
92}
93
94int main(int, char**)
95{
96 test_all<int, short>();
97 test_all<X, int>();
98 test_all<Y, int>();
99#if TEST_STD_VER > 17
100 static_assert(test_all<int, short>());
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(U{3});
114 test<T>(rhs, true);
115 }
116
117 static_assert(!(std::is_constructible<optional<X>, const optional<Y>&>::value), "");
118
119 return 0;
120}
121

source code of libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp