1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -Wsign-conversion %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 { 11 A(); 12 A(const B&); // expected-note 2 {{candidate constructor}} 13 }; 14 struct B { operator A() const; }; // expected-note 2 {{candidate function}} 15 struct I { operator int(); }; 16 struct J { operator I(); }; 17 struct K { operator double(); }; 18 typedef void (*vfn)(); 19 struct F { operator vfn(); }; 20 struct G { operator vfn(); }; 21 22 struct Base { 23 int trick(); 24 A trick() const; 25 void fn1(); 26 }; 27 struct Derived : Base { 28 void fn2(); 29 }; 30 struct Convertible { operator Base&(); }; 31 struct Priv : private Base {}; // expected-note 4 {{declared private here}} 32 struct Mid : Base {}; 33 struct Fin : Mid, Derived {}; 34 typedef void (Derived::*DFnPtr)(); 35 struct ToMemPtr { operator DFnPtr(); }; 36 37 struct BadDerived; 38 struct BadBase { operator BadDerived&(); }; 39 struct BadDerived : BadBase {}; 40 41 struct Fields { 42 int i1, i2, b1 : 3, b2 : 3; 43 }; 44 struct MixedFields { 45 int i; 46 volatile int vi; 47 const int ci; 48 const volatile int cvi; 49 }; 50 struct MixedFieldsDerived : MixedFields { 51 }; 52 53 enum Enum { EVal }; 54 55 struct Ambig { 56 operator short(); // expected-note 2 {{candidate function}} 57 operator signed char(); // expected-note 2 {{candidate function}} 58 }; 59 60 void test() 61 { 62 // This function tests C++0x 5.16 63 64 // p1 (contextually convert to bool) 65 int i1 = ToBool() ? 0 : 1; 66 67 // p2 (one or both void, and throwing) 68 i1 ? throw 0 : throw 1; 69 i1 ? test() : throw 1; 70 i1 ? throw 0 : test(); 71 i1 ? test() : test(); 72 i1 = i1 ? throw 0 : 0; 73 i1 = i1 ? 0 : throw 0; 74 i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}} 75 i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}} 76 (i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}} 77 (i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}} 78 79 // p3 (one or both class type, convert to each other) 80 // b1 (lvalues) 81 Base base; 82 Derived derived; 83 Convertible conv; 84 Base &bar1 = i1 ? base : derived; 85 Base &bar2 = i1 ? derived : base; 86 Base &bar3 = i1 ? base : conv; 87 Base &bar4 = i1 ? conv : base; 88 // these are ambiguous 89 BadBase bb; 90 BadDerived bd; 91 (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'BadBase' can be converted to 'BadDerived' and vice versa}} 92 (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}} 93 // curiously enough (and a defect?), these are not 94 // for rvalues, hierarchy takes precedence over other conversions 95 (void)(i1 ? BadBase() : BadDerived()); 96 (void)(i1 ? BadDerived() : BadBase()); 97 98 // b2.1 (hierarchy stuff) 99 extern const Base constret(); 100 extern const Derived constder(); 101 // should use const overload 102 A a1((i1 ? constret() : Base()).trick()); 103 A a2((i1 ? Base() : constret()).trick()); 104 A a3((i1 ? constret() : Derived()).trick()); 105 A a4((i1 ? Derived() : constret()).trick()); 106 // should use non-const overload 107 i1 = (i1 ? Base() : Base()).trick(); 108 i1 = (i1 ? Base() : Base()).trick(); 109 i1 = (i1 ? Base() : Derived()).trick(); 110 i1 = (i1 ? Derived() : Base()).trick(); 111 // should fail: const lost 112 (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('Base' and 'const Derived')}} 113 (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('const Derived' and 'Base')}} 114 115 Priv priv; 116 Fin fin; 117 (void)(i1 ? Base() : Priv()); // expected-error{{private base class}} 118 (void)(i1 ? Priv() : Base()); // expected-error{{private base class}} 119 (void)(i1 ? Base() : Fin()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 120 (void)(i1 ? Fin() : Base()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 121 (void)(i1 ? base : priv); // expected-error {{private base class}} 122 (void)(i1 ? priv : base); // expected-error {{private base class}} 123 (void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 124 (void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 125 126 // b2.2 (non-hierarchy) 127 i1 = i1 ? I() : i1; 128 i1 = i1 ? i1 : I(); 129 I i2(i1 ? I() : J()); 130 I i3(i1 ? J() : I()); 131 // "the type [it] woud have if E2 were converted to an rvalue" 132 vfn pfn = i1 ? F() : test; 133 pfn = i1 ? test : F(); 134 (void)(i1 ? A() : B()); // expected-error {{conversion from 'B' to 'A' is ambiguous}} 135 (void)(i1 ? B() : A()); // expected-error {{conversion from 'B' to 'A' is ambiguous}} 136 (void)(i1 ? 1 : Ambig()); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}} 137 (void)(i1 ? Ambig() : 1); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}} 138 // By the way, this isn't an lvalue: 139 &(i1 ? i1 : i2); // expected-error {{address expression must be an lvalue or a function designator}} 140 141 // p4 (lvalue, same type) 142 Fields flds; 143 int &ir1 = i1 ? flds.i1 : flds.i2; 144 (i1 ? flds.b1 : flds.i2) = 0; 145 (i1 ? flds.i1 : flds.b2) = 0; 146 (i1 ? flds.b1 : flds.b2) = 0; 147 148 // p5 (conversion to built-in types) 149 // GCC 4.3 fails these 150 double d1 = i1 ? I() : K(); 151 pfn = i1 ? F() : G(); 152 DFnPtr pfm; 153 pfm = i1 ? DFnPtr() : &Base::fn1; 154 pfm = i1 ? &Base::fn1 : DFnPtr(); 155 156 // p6 (final conversions) 157 i1 = i1 ? i1 : ir1; 158 int *pi1 = i1 ? &i1 : 0; 159 pi1 = i1 ? 0 : &i1; 160 i1 = i1 ? i1 : EVal; 161 i1 = i1 ? EVal : i1; 162 d1 = i1 ? 'c' : 4.0; 163 d1 = i1 ? 4.0 : 'c'; 164 Base *pb = i1 ? (Base*)0 : (Derived*)0; 165 pb = i1 ? (Derived*)0 : (Base*)0; 166 pfm = i1 ? &Base::fn1 : &Derived::fn2; 167 pfm = i1 ? &Derived::fn2 : &Base::fn1; 168 pfm = i1 ? &Derived::fn2 : 0; 169 pfm = i1 ? 0 : &Derived::fn2; 170 const int (MixedFieldsDerived::*mp1) = 171 i1 ? &MixedFields::ci : &MixedFieldsDerived::i; 172 const volatile int (MixedFields::*mp2) = 173 i1 ? &MixedFields::ci : &MixedFields::cvi; 174 (void)(i1 ? &MixedFields::ci : &MixedFields::vi); 175 // Conversion of primitives does not result in an lvalue. 176 &(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}} 177 178 (void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}} 179 (void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}} 180 181 182 unsigned long test0 = 5; 183 test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}} 184 test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 185 test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}} 186 test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}} 187 test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 188 test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}} 189 test0 = test0 ? test0 : (long) 10; 190 test0 = test0 ? test0 : (int) 10; 191 test0 = test0 ? test0 : (short) 10; 192 test0 = test0 ? (long) 10 : test0; 193 test0 = test0 ? (int) 10 : test0; 194 test0 = test0 ? (short) 10 : test0; 195 196 int test1; 197 test0 = test0 ? EVal : test0; 198 test1 = test0 ? EVal : (int) test0; 199 200 test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 201 test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 202 203 test1 = test0 ? EVal : (int) test0; 204 test1 = test0 ? (int) test0 : EVal; 205 206 // Note the thing that this does not test: since DR446, various situations 207 // *must* create a separate temporary copy of class objects. This can only 208 // be properly tested at runtime, though. 209 } 210 211 namespace PR6595 { 212 struct OtherString { 213 OtherString(); 214 OtherString(const char*); 215 }; 216 217 struct String { 218 String(const char *); 219 String(const OtherString&); 220 operator const char*() const; 221 }; 222 223 void f(bool Cond, String S, OtherString OS) { 224 (void)(Cond? S : ""); 225 (void)(Cond? "" : S); 226 const char a[1] = {'a'}; 227 (void)(Cond? S : a); 228 (void)(Cond? a : S); 229 (void)(Cond? OS : S); 230 } 231 } 232 233 namespace PR6757 { 234 struct Foo1 { 235 Foo1(); 236 Foo1(const Foo1&); 237 }; 238 239 struct Foo2 { }; 240 241 struct Foo3 { 242 Foo3(); 243 Foo3(Foo3&); // expected-note{{would lose const qualifier}} 244 }; 245 246 struct Bar { 247 operator const Foo1&() const; 248 operator const Foo2&() const; 249 operator const Foo3&() const; 250 }; 251 252 void f() { 253 (void)(true ? Bar() : Foo1()); // okay 254 (void)(true ? Bar() : Foo2()); // okay 255 (void)(true ? Bar() : Foo3()); // expected-error{{no viable constructor copying temporary}} 256 } 257 } 258 259 // Reduced from selfhost. 260 namespace test1 { 261 struct A { 262 enum Foo { 263 fa, fb, fc, fd, fe, ff 264 }; 265 266 Foo x(); 267 }; 268 269 void foo(int); 270 271 void test(A *a) { 272 foo(a ? a->x() : 0); 273 } 274 } 275 276 namespace rdar7998817 { 277 class X { 278 X(X&); // expected-note{{declared private here}} 279 280 struct ref { }; 281 282 public: 283 X(); 284 X(ref); 285 286 operator ref(); 287 }; 288 289 void f(bool B) { 290 X x; 291 (void)(B? x // expected-error{{calling a private constructor of class 'rdar7998817::X'}} 292 : X()); 293 } 294 } 295 296 namespace PR7598 { 297 enum Enum { 298 v = 1, 299 }; 300 301 const Enum g() { 302 return v; 303 } 304 305 const volatile Enum g2() { 306 return v; 307 } 308 309 void f() { 310 const Enum v2 = v; 311 Enum e = false ? g() : v; 312 Enum e2 = false ? v2 : v; 313 Enum e3 = false ? g2() : v; 314 } 315 316 } 317 318 namespace PR9236 { 319 #define NULL 0L 320 void f() { 321 int i; 322 (void)(true ? A() : NULL); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 323 (void)(true ? NULL : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 324 (void)(true ? 0 : A()); // expected-error{{incompatible operand types}} 325 (void)(true ? nullptr : A()); // expected-error{{non-pointer operand type 'A' incompatible with nullptr}} 326 (void)(true ? nullptr : i); // expected-error{{non-pointer operand type 'int' incompatible with nullptr}} 327 (void)(true ? __null : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 328 (void)(true ? (void*)0 : A()); // expected-error{{incompatible operand types}} 329 } 330 } 331
