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 14 #include <experimental/optional> 15 #include <type_traits> 16 #include <cassert> 17 #include <memory> 18 19 #if _LIBCPP_STD_VER > 11 20 21 using std::experimental::optional; 22 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 { 63 optional<int> opt; 64 opt.emplace(); 65 assert(static_cast<bool>(opt) == true); 66 assert(*opt == 0); 67 } 68 { 69 optional<int> opt; 70 opt.emplace(1); 71 assert(static_cast<bool>(opt) == true); 72 assert(*opt == 1); 73 } 74 { 75 optional<int> opt(2); 76 opt.emplace(); 77 assert(static_cast<bool>(opt) == true); 78 assert(*opt == 0); 79 } 80 { 81 optional<int> opt(2); 82 opt.emplace(1); 83 assert(static_cast<bool>(opt) == true); 84 assert(*opt == 1); 85 } 86 { 87 optional<X> opt; 88 opt.emplace(); 89 assert(static_cast<bool>(opt) == true); 90 assert(*opt == X()); 91 } 92 { 93 optional<X> opt; 94 opt.emplace(1); 95 assert(static_cast<bool>(opt) == true); 96 assert(*opt == X(1)); 97 } 98 { 99 optional<X> opt; 100 opt.emplace(1, 2); 101 assert(static_cast<bool>(opt) == true); 102 assert(*opt == X(1, 2)); 103 } 104 { 105 optional<X> opt(X{3}); 106 opt.emplace(); 107 assert(static_cast<bool>(opt) == true); 108 assert(*opt == X()); 109 } 110 { 111 optional<X> opt(X{3}); 112 opt.emplace(1); 113 assert(static_cast<bool>(opt) == true); 114 assert(*opt == X(1)); 115 } 116 { 117 optional<X> opt(X{3}); 118 opt.emplace(1, 2); 119 assert(static_cast<bool>(opt) == true); 120 assert(*opt == X(1, 2)); 121 } 122 { 123 Y y; 124 { 125 optional<Y> opt(y); 126 assert(Y::dtor_called == false); 127 opt.emplace(); 128 assert(Y::dtor_called == true); 129 } 130 } 131 { 132 Z z; 133 optional<Z> opt(z); 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 } 149
