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++11 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 struct Abstract { 61 virtual ~Abstract() = 0; // expected-note {{unimplemented pure virtual method '~Abstract' in 'Abstract'}} 62 }; 63 64 struct Derived1: Abstract { 65 }; 66 67 struct Derived2: Abstract { 68 }; 69 70 void test() 71 { 72 // This function tests C++0x 5.16 73 74 // p1 (contextually convert to bool) 75 int i1 = ToBool() ? 0 : 1; 76 77 // p2 (one or both void, and throwing) 78 i1 ? throw 0 : throw 1; 79 i1 ? test() : throw 1; 80 i1 ? throw 0 : test(); 81 i1 ? test() : test(); 82 i1 = i1 ? throw 0 : 0; 83 i1 = i1 ? 0 : throw 0; 84 i1 = i1 ? (throw 0) : 0; 85 i1 = i1 ? 0 : (throw 0); 86 i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}} 87 i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}} 88 (i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}} 89 (i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}} 90 91 // p3 (one or both class type, convert to each other) 92 // b1 (lvalues) 93 Base base; 94 Derived derived; 95 Convertible conv; 96 Base &bar1 = i1 ? base : derived; 97 Base &bar2 = i1 ? derived : base; 98 Base &bar3 = i1 ? base : conv; 99 Base &bar4 = i1 ? conv : base; 100 // these are ambiguous 101 BadBase bb; 102 BadDerived bd; 103 (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'BadBase' can be converted to 'BadDerived' and vice versa}} 104 (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}} 105 // curiously enough (and a defect?), these are not 106 // for rvalues, hierarchy takes precedence over other conversions 107 (void)(i1 ? BadBase() : BadDerived()); 108 (void)(i1 ? BadDerived() : BadBase()); 109 110 // b2.1 (hierarchy stuff) 111 extern const Base constret(); 112 extern const Derived constder(); 113 // should use const overload 114 A a1((i1 ? constret() : Base()).trick()); 115 A a2((i1 ? Base() : constret()).trick()); 116 A a3((i1 ? constret() : Derived()).trick()); 117 A a4((i1 ? Derived() : constret()).trick()); 118 // should use non-const overload 119 i1 = (i1 ? Base() : Base()).trick(); 120 i1 = (i1 ? Base() : Base()).trick(); 121 i1 = (i1 ? Base() : Derived()).trick(); 122 i1 = (i1 ? Derived() : Base()).trick(); 123 // should fail: const lost 124 (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('Base' and 'const Derived')}} 125 (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('const Derived' and 'Base')}} 126 127 Priv priv; 128 Fin fin; 129 (void)(i1 ? Base() : Priv()); // expected-error{{private base class}} 130 (void)(i1 ? Priv() : Base()); // expected-error{{private base class}} 131 (void)(i1 ? Base() : Fin()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 132 (void)(i1 ? Fin() : Base()); // expected-error{{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 133 (void)(i1 ? base : priv); // expected-error {{private base class}} 134 (void)(i1 ? priv : base); // expected-error {{private base class}} 135 (void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 136 (void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'Fin' to base class 'Base':}} 137 138 // b2.2 (non-hierarchy) 139 i1 = i1 ? I() : i1; 140 i1 = i1 ? i1 : I(); 141 I i2(i1 ? I() : J()); 142 I i3(i1 ? J() : I()); 143 // "the type [it] woud have if E2 were converted to an rvalue" 144 vfn pfn = i1 ? F() : test; 145 pfn = i1 ? test : F(); 146 (void)(i1 ? A() : B()); // expected-error {{conversion from 'B' to 'A' is ambiguous}} 147 (void)(i1 ? B() : A()); // expected-error {{conversion from 'B' to 'A' is ambiguous}} 148 (void)(i1 ? 1 : Ambig()); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}} 149 (void)(i1 ? Ambig() : 1); // expected-error {{conversion from 'Ambig' to 'int' is ambiguous}} 150 // By the way, this isn't an lvalue: 151 &(i1 ? i1 : i2); // expected-error {{cannot take the address of an rvalue}} 152 153 // p4 (lvalue, same type) 154 Fields flds; 155 int &ir1 = i1 ? flds.i1 : flds.i2; 156 (i1 ? flds.b1 : flds.i2) = 0; 157 (i1 ? flds.i1 : flds.b2) = 0; 158 (i1 ? flds.b1 : flds.b2) = 0; 159 160 // p5 (conversion to built-in types) 161 // GCC 4.3 fails these 162 double d1 = i1 ? I() : K(); 163 pfn = i1 ? F() : G(); 164 DFnPtr pfm; 165 pfm = i1 ? DFnPtr() : &Base::fn1; 166 pfm = i1 ? &Base::fn1 : DFnPtr(); 167 168 // p6 (final conversions) 169 i1 = i1 ? i1 : ir1; 170 int *pi1 = i1 ? &i1 : 0; 171 pi1 = i1 ? 0 : &i1; 172 i1 = i1 ? i1 : EVal; 173 i1 = i1 ? EVal : i1; 174 d1 = i1 ? 'c' : 4.0; 175 d1 = i1 ? 4.0 : 'c'; 176 Base *pb = i1 ? (Base*)0 : (Derived*)0; 177 pb = i1 ? (Derived*)0 : (Base*)0; 178 pfm = i1 ? &Base::fn1 : &Derived::fn2; 179 pfm = i1 ? &Derived::fn2 : &Base::fn1; 180 pfm = i1 ? &Derived::fn2 : 0; 181 pfm = i1 ? 0 : &Derived::fn2; 182 const int (MixedFieldsDerived::*mp1) = 183 i1 ? &MixedFields::ci : &MixedFieldsDerived::i; 184 const volatile int (MixedFields::*mp2) = 185 i1 ? &MixedFields::ci : &MixedFields::cvi; 186 (void)(i1 ? &MixedFields::ci : &MixedFields::vi); 187 // Conversion of primitives does not result in an lvalue. 188 &(i1 ? i1 : d1); // expected-error {{cannot take the address of an rvalue}} 189 190 (void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}} 191 (void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}} 192 193 194 unsigned long test0 = 5; 195 test0 = test0 ? (long) test0 : test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}} 196 test0 = test0 ? (int) test0 : test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 197 test0 = test0 ? (short) test0 : test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}} 198 test0 = test0 ? test0 : (long) test0; // expected-warning {{operand of ? changes signedness: 'long' to 'unsigned long'}} 199 test0 = test0 ? test0 : (int) test0; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 200 test0 = test0 ? test0 : (short) test0; // expected-warning {{operand of ? changes signedness: 'short' to 'unsigned long'}} 201 test0 = test0 ? test0 : (long) 10; 202 test0 = test0 ? test0 : (int) 10; 203 test0 = test0 ? test0 : (short) 10; 204 test0 = test0 ? (long) 10 : test0; 205 test0 = test0 ? (int) 10 : test0; 206 test0 = test0 ? (short) 10 : test0; 207 208 int test1; 209 test0 = test0 ? EVal : test0; 210 test1 = test0 ? EVal : (int) test0; 211 212 test0 = test0 ? EVal : test1; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 213 test0 = test0 ? test1 : EVal; // expected-warning {{operand of ? changes signedness: 'int' to 'unsigned long'}} 214 215 test1 = test0 ? EVal : (int) test0; 216 test1 = test0 ? (int) test0 : EVal; 217 218 // Note the thing that this does not test: since DR446, various situations 219 // *must* create a separate temporary copy of class objects. This can only 220 // be properly tested at runtime, though. 221 222 const Abstract &a = true ? static_cast<const Abstract&>(Derived1()) : Derived2(); // expected-error {{allocating an object of abstract class type 'const Abstract'}} 223 true ? static_cast<const Abstract&>(Derived1()) : throw 3; // expected-error {{allocating an object of abstract class type 'const Abstract'}} 224 } 225 226 namespace PR6595 { 227 struct OtherString { 228 OtherString(); 229 OtherString(const char*); 230 }; 231 232 struct String { 233 String(const char *); 234 String(const OtherString&); 235 operator const char*() const; 236 }; 237 238 void f(bool Cond, String S, OtherString OS) { 239 (void)(Cond? S : ""); 240 (void)(Cond? "" : S); 241 const char a[1] = {'a'}; 242 (void)(Cond? S : a); 243 (void)(Cond? a : S); 244 (void)(Cond? OS : S); 245 } 246 } 247 248 namespace PR6757 { 249 struct Foo1 { 250 Foo1(); 251 Foo1(const Foo1&); 252 }; 253 254 struct Foo2 { }; 255 256 struct Foo3 { 257 Foo3(); 258 Foo3(Foo3&); // expected-note{{would lose const qualifier}} 259 }; 260 261 struct Bar { 262 operator const Foo1&() const; 263 operator const Foo2&() const; 264 operator const Foo3&() const; 265 }; 266 267 void f() { 268 (void)(true ? Bar() : Foo1()); // okay 269 (void)(true ? Bar() : Foo2()); // okay 270 (void)(true ? Bar() : Foo3()); // expected-error{{no viable constructor copying temporary}} 271 } 272 } 273 274 // Reduced from selfhost. 275 namespace test1 { 276 struct A { 277 enum Foo { 278 fa, fb, fc, fd, fe, ff 279 }; 280 281 Foo x(); 282 }; 283 284 void foo(int); 285 286 void test(A *a) { 287 foo(a ? a->x() : 0); 288 } 289 } 290 291 namespace rdar7998817 { 292 class X { 293 X(X&); // expected-note{{declared private here}} 294 295 struct ref { }; 296 297 public: 298 X(); 299 X(ref); 300 301 operator ref(); 302 }; 303 304 void f(bool B) { 305 X x; 306 (void)(B? x // expected-error{{calling a private constructor of class 'rdar7998817::X'}} 307 : X()); 308 } 309 } 310 311 namespace PR7598 { 312 enum Enum { 313 v = 1, 314 }; 315 316 const Enum g() { 317 return v; 318 } 319 320 const volatile Enum g2() { 321 return v; 322 } 323 324 void f() { 325 const Enum v2 = v; 326 Enum e = false ? g() : v; 327 Enum e2 = false ? v2 : v; 328 Enum e3 = false ? g2() : v; 329 } 330 331 } 332 333 namespace PR9236 { 334 #define NULL 0L 335 void f() { 336 int i; 337 (void)(true ? A() : NULL); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 338 (void)(true ? NULL : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 339 (void)(true ? 0 : A()); // expected-error{{incompatible operand types}} 340 (void)(true ? nullptr : A()); // expected-error{{non-pointer operand type 'A' incompatible with nullptr}} 341 (void)(true ? nullptr : i); // expected-error{{non-pointer operand type 'int' incompatible with nullptr}} 342 (void)(true ? __null : A()); // expected-error{{non-pointer operand type 'A' incompatible with NULL}} 343 (void)(true ? (void*)0 : A()); // expected-error{{incompatible operand types}} 344 } 345 } 346 347 namespace DR587 { 348 template<typename T> 349 const T *f(bool b) { 350 static T t1 = T(); 351 static const T t2 = T(); 352 return &(b ? t1 : t2); 353 } 354 struct S {}; 355 template const int *f(bool); 356 template const S *f(bool); 357 358 extern bool b; 359 int i = 0; 360 const int ci = 0; 361 volatile int vi = 0; 362 const volatile int cvi = 0; 363 364 const int &cir = b ? i : ci; 365 volatile int &vir = b ? vi : i; 366 const volatile int &cvir1 = b ? ci : cvi; 367 const volatile int &cvir2 = b ? cvi : vi; 368 const volatile int &cvir3 = b ? ci : vi; // expected-error{{volatile lvalue reference to type 'const volatile int' cannot bind to a temporary of type 'int'}} 369 } 370
