1 // RUN: clang-cc -fsyntax-only -verify -std=c++0x %s 2 3 // C++ rules for ?: are a lot stricter than C rules, and have to take into 4 // account more conversion options. 5 // This test runs in C++0x mode for the contextual conversion of the condition. 6 7 struct ToBool { explicit operator bool(); }; 8 9 struct B; 10 struct A { A(); A(const B&); }; 11 struct B { operator A() const; }; 12 struct I { operator int(); }; 13 struct J { operator I(); }; 14 struct K { operator double(); }; 15 typedef void (*vfn)(); 16 struct F { operator vfn(); }; 17 struct G { operator vfn(); }; 18 19 struct Base { 20 int trick(); 21 A trick() const; 22 void fn1(); 23 }; 24 struct Derived : Base { 25 void fn2(); 26 }; 27 struct Convertible { operator Base&(); }; 28 struct Priv : private Base {}; 29 struct Mid : Base {}; 30 struct Fin : Mid, Derived {}; 31 typedef void (Derived::*DFnPtr)(); 32 struct ToMemPtr { operator DFnPtr(); }; 33 34 struct BadDerived; 35 struct BadBase { operator BadDerived&(); }; 36 struct BadDerived : BadBase {}; 37 38 struct Fields { 39 int i1, i2, b1 : 3, b2 : 3; 40 }; 41 struct MixedFields { 42 int i; 43 volatile int vi; 44 const int ci; 45 const volatile int cvi; 46 }; 47 struct MixedFieldsDerived : MixedFields { 48 }; 49 50 enum Enum { EVal }; 51 52 struct Ambig { 53 operator short(); 54 operator signed char(); 55 }; 56 57 void test() 58 { 59 // This function tests C++0x 5.16 60 61 // p1 (contextually convert to bool) 62 int i1 = ToBool() ? 0 : 1; 63 64 // p2 (one or both void, and throwing) 65 i1 ? throw 0 : throw 1; 66 i1 ? test() : throw 1; 67 i1 ? throw 0 : test(); 68 i1 ? test() : test(); 69 i1 = i1 ? throw 0 : 0; 70 i1 = i1 ? 0 : throw 0; 71 i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}} 72 i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}} 73 (i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}} 74 (i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}} 75 76 // p3 (one or both class type, convert to each other) 77 // b1 (lvalues) 78 Base base; 79 Derived derived; 80 Convertible conv; 81 Base &bar1 = i1 ? base : derived; 82 Base &bar2 = i1 ? derived : base; 83 Base &bar3 = i1 ? base : conv; 84 Base &bar4 = i1 ? conv : base; 85 // these are ambiguous 86 BadBase bb; 87 BadDerived bd; 88 (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'struct BadBase' can be converted to 'struct BadDerived' and vice versa}} 89 (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}} 90 // curiously enough (and a defect?), these are not 91 // for rvalues, hierarchy takes precedence over other conversions 92 (void)(i1 ? BadBase() : BadDerived()); 93 (void)(i1 ? BadDerived() : BadBase()); 94 95 // b2.1 (hierarchy stuff) 96 const Base constret(); 97 const Derived constder(); 98 // should use const overload 99 A a1((i1 ? constret() : Base()).trick()); 100 A a2((i1 ? Base() : constret()).trick()); 101 A a3((i1 ? constret() : Derived()).trick()); 102 A a4((i1 ? Derived() : constret()).trick()); 103 // should use non-const overload 104 i1 = (i1 ? Base() : Base()).trick(); 105 i1 = (i1 ? Base() : Base()).trick(); 106 i1 = (i1 ? Base() : Derived()).trick(); 107 i1 = (i1 ? Derived() : Base()).trick(); 108 // should fail: const lost 109 (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('struct Base' and 'struct Derived const')}} 110 (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('struct Derived const' and 'struct Base')}} 111 // FIXME: should fail: private or ambiguous base 112 (void)(i1 ? Base() : Priv()); // xpected-error private base 113 (void)(i1 ? Priv() : Base()); // xpected-error private base 114 (void)(i1 ? Base() : Fin()); // xpected-error ambiguous base 115 (void)(i1 ? Fin() : Base()); // xpected-error ambiguous base 116 117 // b2.2 (non-hierarchy) 118 i1 = i1 ? I() : i1; 119 i1 = i1 ? i1 : I(); 120 I i2(i1 ? I() : J()); 121 I i3(i1 ? J() : I()); 122 // "the type [it] woud have if E2 were converted to an rvalue" 123 vfn pfn = i1 ? F() : test; 124 pfn = i1 ? test : F(); 125 // these are ambiguous - better messages would be nice 126 (void)(i1 ? A() : B()); // expected-error {{incompatible operand types}} 127 (void)(i1 ? B() : A()); // expected-error {{incompatible operand types}} 128 (void)(i1 ? 1 : Ambig()); // expected-error {{incompatible operand types}} 129 (void)(i1 ? Ambig() : 1); // expected-error {{incompatible operand types}} 130 // By the way, this isn't an lvalue: 131 &(i1 ? i1 : i2); // expected-error {{address expression must be an lvalue or a function designator}} 132 133 // p4 (lvalue, same type) 134 Fields flds; 135 int &ir1 = i1 ? flds.i1 : flds.i2; 136 (i1 ? flds.b1 : flds.i2) = 0; 137 (i1 ? flds.i1 : flds.b2) = 0; 138 (i1 ? flds.b1 : flds.b2) = 0; 139 140 // p5 (conversion to built-in types) 141 // GCC 4.3 fails these 142 double d1 = i1 ? I() : K(); 143 pfn = i1 ? F() : G(); 144 DFnPtr pfm; 145 // FIXME: Overload resolution won't choose the member pointer yet. 146 //pfm = i1 ? DFnPtr() : &Base::fn1; 147 //pfm = i1 ? &Base::fn1 : DFnPtr(); 148 149 // p6 (final conversions) 150 i1 = i1 ? i1 : ir1; 151 int *pi1 = i1 ? &i1 : 0; 152 pi1 = i1 ? 0 : &i1; 153 i1 = i1 ? i1 : EVal; 154 i1 = i1 ? EVal : i1; 155 d1 = i1 ? 'c' : 4.0; 156 d1 = i1 ? 4.0 : 'c'; 157 Base *pb = i1 ? (Base*)0 : (Derived*)0; 158 pb = i1 ? (Derived*)0 : (Base*)0; 159 pfm = i1 ? &Base::fn1 : &Derived::fn2; 160 pfm = i1 ? &Derived::fn2 : &Base::fn1; 161 pfm = i1 ? &Derived::fn2 : 0; 162 pfm = i1 ? 0 : &Derived::fn2; 163 const int (MixedFieldsDerived::*mp1) = 164 i1 ? &MixedFields::ci : &MixedFieldsDerived::i; 165 const volatile int (MixedFields::*mp2) = 166 i1 ? &MixedFields::ci : &MixedFields::cvi; 167 i1 ? &MixedFields::ci : &MixedFields::vi; // expected-error {{incompatible operand types}} 168 // Conversion of primitives does not result in an lvalue. 169 &(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}} 170 171 172 // Note the thing that this does not test: since DR446, various situations 173 // *must* create a separate temporary copy of class objects. This can only 174 // be properly tested at runtime, though. 175 } 176