1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // UNSUPPORTED: c++98, c++03, c++11
13 // template <class U, class... Args>
15 // explicit optional(in_place_t, initializer_list<U> il, Args&&... args);
17 #include <experimental/optional>
18 #include <type_traits>
22 #include "test_macros.h"
24 using std::experimental::optional;
25 using std::experimental::in_place_t;
26 using std::experimental::in_place;
35 X(int i, int j) : i_(i), j_(j) {}
39 friend bool operator==(const X& x, const X& y)
40 {return x.i_ == y.i_ && x.j_ == y.j_;}
48 constexpr Y() : i_(0) {}
49 constexpr Y(int i) : i_(i) {}
50 constexpr Y(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {}
52 friend constexpr bool operator==(const Y& x, const Y& y)
53 {return x.i_ == y.i_ && x.j_ == y.j_;}
61 constexpr Z() : i_(0) {}
62 constexpr Z(int i) : i_(i) {}
63 Z(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1])
66 friend constexpr bool operator==(const Z& x, const Z& y)
67 {return x.i_ == y.i_ && x.j_ == y.j_;}
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, "");
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);
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);
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}, "");
94 struct test_constexpr_ctor
97 constexpr test_constexpr_ctor(in_place_t, std::initializer_list<int> i)
98 : optional<Y>(in_place, i) {}
101 constexpr test_constexpr_ctor dopt(in_place, {42, 101, -1});
102 static_assert(*dopt == Y{42, 101, -1}, "");
104 #ifndef TEST_HAS_NO_EXCEPTIONS
106 static_assert(std::is_constructible<optional<Z>, std::initializer_list<int>&>::value, "");
109 optional<Z> opt(in_place, {3, 1});