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// constexpr optional<T>& operator=(const optional<T>& rhs);
13
14#include <optional>
15#include <type_traits>
16#include <cassert>
17
18#include "test_macros.h"
19#include "archetypes.h"
20
21using std::optional;
22
23struct X
24{
25 static bool throw_now;
26
27 X() = default;
28 X(const X&)
29 {
30 if (throw_now)
31 TEST_THROW(6);
32 }
33 X& operator=(X const&) = default;
34};
35
36bool X::throw_now = false;
37
38template <class Tp>
39constexpr bool assign_empty(optional<Tp>&& lhs) {
40 const optional<Tp> rhs;
41 lhs = rhs;
42 return !lhs.has_value() && !rhs.has_value();
43}
44
45template <class Tp>
46constexpr bool assign_value(optional<Tp>&& lhs) {
47 const optional<Tp> rhs(101);
48 lhs = rhs;
49 return lhs.has_value() && rhs.has_value() && *lhs == *rhs;
50}
51
52int main(int, char**)
53{
54 {
55 using O = optional<int>;
56 static_assert(assign_empty(lhs: O{42}));
57 static_assert(assign_value(lhs: O{42}));
58 assert(assign_empty(O{42}));
59 assert(assign_value(O{42}));
60 }
61 {
62 using O = optional<TrivialTestTypes::TestType>;
63 static_assert(assign_empty(O{42}));
64 static_assert(assign_value(O{42}));
65 assert(assign_empty(O{42}));
66 assert(assign_value(O{42}));
67 }
68 {
69 using O = optional<TestTypes::TestType>;
70 assert(assign_empty(O{42}));
71 assert(assign_value(O{42}));
72 }
73 {
74 using T = TestTypes::TestType;
75 T::reset();
76 optional<T> opt(3);
77 const optional<T> opt2;
78 assert(T::alive == 1);
79 opt = opt2;
80 assert(T::alive == 0);
81 assert(!opt2.has_value());
82 assert(!opt.has_value());
83 }
84#ifndef TEST_HAS_NO_EXCEPTIONS
85 {
86 optional<X> opt;
87 optional<X> opt2(X{});
88 assert(static_cast<bool>(opt2) == true);
89 try
90 {
91 X::throw_now = true;
92 opt = opt2;
93 assert(false);
94 }
95 catch (int i)
96 {
97 assert(i == 6);
98 assert(static_cast<bool>(opt) == false);
99 }
100 }
101#endif
102
103 return 0;
104}
105

source code of libcxx/test/std/utilities/optional/optional.object/optional.object.assign/copy.pass.cpp