Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | // <optional> |
| 11 | |
| 12 | // template <class... Args> void optional<T>::emplace(Args&&... args); |
| 13 | |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 14 | #include <experimental/optional> |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 15 | #include <type_traits> |
| 16 | #include <cassert> |
| 17 | #include <memory> |
| 18 | |
| 19 | #if _LIBCPP_STD_VER > 11 |
| 20 | |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 21 | using std::experimental::optional; |
| 22 | |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 23 | class X |
| 24 | { |
| 25 | int i_; |
| 26 | int j_ = 0; |
| 27 | public: |
| 28 | X() : i_(0) {} |
| 29 | X(int i) : i_(i) {} |
| 30 | X(int i, int j) : i_(i), j_(j) {} |
| 31 | |
| 32 | friend bool operator==(const X& x, const X& y) |
| 33 | {return x.i_ == y.i_ && x.j_ == y.j_;} |
| 34 | }; |
| 35 | |
| 36 | class Y |
| 37 | { |
| 38 | public: |
| 39 | static bool dtor_called; |
| 40 | Y() = default; |
| 41 | ~Y() {dtor_called = true;} |
| 42 | }; |
| 43 | |
| 44 | bool Y::dtor_called = false; |
| 45 | |
| 46 | class Z |
| 47 | { |
| 48 | public: |
| 49 | static bool dtor_called; |
| 50 | Z() = default; |
| 51 | Z(int) {throw 6;} |
| 52 | ~Z() {dtor_called = true;} |
| 53 | }; |
| 54 | |
| 55 | bool Z::dtor_called = false; |
| 56 | |
| 57 | #endif // _LIBCPP_STD_VER > 11 |
| 58 | |
| 59 | int main() |
| 60 | { |
| 61 | #if _LIBCPP_STD_VER > 11 |
| 62 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 63 | optional<int> opt; |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 64 | opt.emplace(); |
| 65 | assert(static_cast<bool>(opt) == true); |
| 66 | assert(*opt == 0); |
| 67 | } |
| 68 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 69 | optional<int> opt; |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 70 | opt.emplace(1); |
| 71 | assert(static_cast<bool>(opt) == true); |
| 72 | assert(*opt == 1); |
| 73 | } |
| 74 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 75 | optional<int> opt(2); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 76 | opt.emplace(); |
| 77 | assert(static_cast<bool>(opt) == true); |
| 78 | assert(*opt == 0); |
| 79 | } |
| 80 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 81 | optional<int> opt(2); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 82 | opt.emplace(1); |
| 83 | assert(static_cast<bool>(opt) == true); |
| 84 | assert(*opt == 1); |
| 85 | } |
| 86 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 87 | optional<X> opt; |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 88 | opt.emplace(); |
| 89 | assert(static_cast<bool>(opt) == true); |
| 90 | assert(*opt == X()); |
| 91 | } |
| 92 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 93 | optional<X> opt; |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 94 | opt.emplace(1); |
| 95 | assert(static_cast<bool>(opt) == true); |
| 96 | assert(*opt == X(1)); |
| 97 | } |
| 98 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 99 | optional<X> opt; |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 100 | opt.emplace(1, 2); |
| 101 | assert(static_cast<bool>(opt) == true); |
| 102 | assert(*opt == X(1, 2)); |
| 103 | } |
| 104 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 105 | optional<X> opt(X{3}); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 106 | opt.emplace(); |
| 107 | assert(static_cast<bool>(opt) == true); |
| 108 | assert(*opt == X()); |
| 109 | } |
| 110 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 111 | optional<X> opt(X{3}); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 112 | opt.emplace(1); |
| 113 | assert(static_cast<bool>(opt) == true); |
| 114 | assert(*opt == X(1)); |
| 115 | } |
| 116 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 117 | optional<X> opt(X{3}); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 118 | opt.emplace(1, 2); |
| 119 | assert(static_cast<bool>(opt) == true); |
| 120 | assert(*opt == X(1, 2)); |
| 121 | } |
| 122 | { |
| 123 | Y y; |
| 124 | { |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 125 | optional<Y> opt(y); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 126 | assert(Y::dtor_called == false); |
| 127 | opt.emplace(); |
| 128 | assert(Y::dtor_called == true); |
| 129 | } |
| 130 | } |
| 131 | { |
| 132 | Z z; |
Marshall Clow | 0cdbe60 | 2013-11-15 22:42:10 +0000 | [diff] [blame] | 133 | optional<Z> opt(z); |
Howard Hinnant | 01afa5c | 2013-09-02 20:30:37 +0000 | [diff] [blame] | 134 | try |
| 135 | { |
| 136 | assert(static_cast<bool>(opt) == true); |
| 137 | assert(Z::dtor_called == false); |
| 138 | opt.emplace(1); |
| 139 | } |
| 140 | catch (int i) |
| 141 | { |
| 142 | assert(i == 6); |
| 143 | assert(static_cast<bool>(opt) == false); |
| 144 | assert(Z::dtor_called == true); |
| 145 | } |
| 146 | } |
| 147 | #endif // _LIBCPP_STD_VER > 11 |
| 148 | } |