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, class... Args>
13 // constexpr
14 // explicit optional(in_place_t, initializer_list<U> il, Args&&... args);
15
16 #include <optional>
17 #include <type_traits>
18 #include <memory>
19 #include <vector>
20 #include <cassert>
21
22 #include "test_macros.h"
23
24 using std::optional;
25 using std::in_place_t;
26 using std::in_place;
27
28 class X
29 {
30 int i_;
31 int j_ = 0;
32 public:
X()33 X() : i_(0) {}
X(int i)34 X(int i) : i_(i) {}
X(int i,int j)35 X(int i, int j) : i_(i), j_(j) {}
36
~X()37 ~X() {}
38
operator ==(const X & x,const X & y)39 friend bool operator==(const X& x, const X& y)
40 {return x.i_ == y.i_ && x.j_ == y.j_;}
41 };
42
43 class Y
44 {
45 int i_;
46 int j_ = 0;
47 public:
Y()48 constexpr Y() : i_(0) {}
Y(int i)49 constexpr Y(int i) : i_(i) {}
Y(std::initializer_list<int> il)50 constexpr Y(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {}
51
operator ==(const Y & x,const Y & y)52 friend constexpr bool operator==(const Y& x, const Y& y)
53 {return x.i_ == y.i_ && x.j_ == y.j_;}
54 };
55
56 class Z
57 {
58 int i_;
59 int j_ = 0;
60 public:
Z()61 Z() : i_(0) {}
Z(int i)62 Z(int i) : i_(i) {}
Z(std::initializer_list<int> il)63 Z(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1])
64 {TEST_THROW(6);}
65
operator ==(const Z & x,const Z & y)66 friend bool operator==(const Z& x, const Z& y)
67 {return x.i_ == y.i_ && x.j_ == y.j_;}
68 };
69
main(int,char **)70 int main(int, char**)
71 {
72 {
73 static_assert(!std::is_constructible<X, std::initializer_list<int>&>::value, "");
74 static_assert(!std::is_constructible<optional<X>, std::initializer_list<int>&>::value, "");
75 }
76 {
77 optional<std::vector<int>> opt(in_place, {3, 1});
78 assert(static_cast<bool>(opt) == true);
79 assert((*opt == std::vector<int>{3, 1}));
80 assert(opt->size() == 2);
81 }
82 {
83 optional<std::vector<int>> opt(in_place, {3, 1}, std::allocator<int>());
84 assert(static_cast<bool>(opt) == true);
85 assert((*opt == std::vector<int>{3, 1}));
86 assert(opt->size() == 2);
87 }
88 {
89 static_assert(std::is_constructible<optional<Y>, std::initializer_list<int>&>::value, "");
90 constexpr optional<Y> opt(in_place, {3, 1});
91 static_assert(static_cast<bool>(opt) == true, "");
92 static_assert(*opt == Y{3, 1}, "");
93
94 struct test_constexpr_ctor
95 : public optional<Y>
96 {
97 constexpr test_constexpr_ctor(in_place_t, std::initializer_list<int> i)
98 : optional<Y>(in_place, i) {}
99 };
100
101 }
102 #ifndef TEST_HAS_NO_EXCEPTIONS
103 {
104 static_assert(std::is_constructible<optional<Z>, std::initializer_list<int>&>::value, "");
105 try
106 {
107 optional<Z> opt(in_place, {3, 1});
108 assert(false);
109 }
110 catch (int i)
111 {
112 assert(i == 6);
113 }
114 }
115 #endif
116
117 return 0;
118 }
119