conditional-expr.cpp revision 1d524c3dde58e4402aab4165e85e9ae6f15f5023
1a33d9b4ebf732a5da6d56fd7319ff6c020789b1cAnders Carlsson// RUN: clang-cc -fsyntax-only -verify -faccess-control -std=c++0x %s 23201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 33201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl// C++ rules for ?: are a lot stricter than C rules, and have to take into 43201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl// account more conversion options. 53201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl// This test runs in C++0x mode for the contextual conversion of the condition. 63201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 73201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct ToBool { explicit operator bool(); }; 83201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 93201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct B; 103201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct A { A(); A(const B&); }; 113201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct B { operator A() const; }; 123201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct I { operator int(); }; 133201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct J { operator I(); }; 143201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct K { operator double(); }; 153201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redltypedef void (*vfn)(); 163201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct F { operator vfn(); }; 173201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct G { operator vfn(); }; 183201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 193201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Base { 203201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl int trick(); 213201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl A trick() const; 2276458501a8963fa11b91c9337a487de6871169b4Sebastian Redl void fn1(); 2376458501a8963fa11b91c9337a487de6871169b4Sebastian Redl}; 2476458501a8963fa11b91c9337a487de6871169b4Sebastian Redlstruct Derived : Base { 2576458501a8963fa11b91c9337a487de6871169b4Sebastian Redl void fn2(); 263201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl}; 273201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Convertible { operator Base&(); }; 28a5cd2cdd11179387aa01f43cb6d6af440e006553Sebastian Redlstruct Priv : private Base {}; // expected-note 2 {{'private' inheritance specifier here}} 293201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Mid : Base {}; 303201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Fin : Mid, Derived {}; 3176458501a8963fa11b91c9337a487de6871169b4Sebastian Redltypedef void (Derived::*DFnPtr)(); 3276458501a8963fa11b91c9337a487de6871169b4Sebastian Redlstruct ToMemPtr { operator DFnPtr(); }; 333201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 343201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct BadDerived; 353201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct BadBase { operator BadDerived&(); }; 363201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct BadDerived : BadBase {}; 373201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 383201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Fields { 393201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl int i1, i2, b1 : 3, b2 : 3; 403201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl}; 419bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redlstruct MixedFields { 429bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl int i; 439bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl volatile int vi; 449bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl const int ci; 459bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl const volatile int cvi; 469bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl}; 479bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redlstruct MixedFieldsDerived : MixedFields { 489bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl}; 493201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 503201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlenum Enum { EVal }; 513201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 523201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlstruct Ambig { 533201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl operator short(); 543201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl operator signed char(); 553201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl}; 563201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 573201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redlvoid test() 583201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl{ 593201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // This function tests C++0x 5.16 603201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 613201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p1 (contextually convert to bool) 623201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl int i1 = ToBool() ? 0 : 1; 633201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 643201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p2 (one or both void, and throwing) 653201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? throw 0 : throw 1; 663201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? test() : throw 1; 673201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? throw 0 : test(); 683201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? test() : test(); 693201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? throw 0 : 0; 703201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? 0 : throw 0; 713201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}} 723201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}} 733201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}} 743201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}} 753201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 763201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p3 (one or both class type, convert to each other) 773201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // b1 (lvalues) 783201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl Base base; 793201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl Derived derived; 803201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl Convertible conv; 8176458501a8963fa11b91c9337a487de6871169b4Sebastian Redl Base &bar1 = i1 ? base : derived; 8276458501a8963fa11b91c9337a487de6871169b4Sebastian Redl Base &bar2 = i1 ? derived : base; 8376458501a8963fa11b91c9337a487de6871169b4Sebastian Redl Base &bar3 = i1 ? base : conv; 8476458501a8963fa11b91c9337a487de6871169b4Sebastian Redl Base &bar4 = i1 ? conv : base; 853201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // these are ambiguous 863201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl BadBase bb; 873201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl BadDerived bd; 883201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'struct BadBase' can be converted to 'struct BadDerived' and vice versa}} 893201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}} 903201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // curiously enough (and a defect?), these are not 913201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // for rvalues, hierarchy takes precedence over other conversions 923201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? BadBase() : BadDerived()); 933201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? BadDerived() : BadBase()); 943201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 953201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // b2.1 (hierarchy stuff) 963201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl const Base constret(); 973201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl const Derived constder(); 983201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // should use const overload 993201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl A a1((i1 ? constret() : Base()).trick()); 1003201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl A a2((i1 ? Base() : constret()).trick()); 1013201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl A a3((i1 ? constret() : Derived()).trick()); 1023201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl A a4((i1 ? Derived() : constret()).trick()); 1033201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // should use non-const overload 1043201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = (i1 ? Base() : Base()).trick(); 1053201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = (i1 ? Base() : Base()).trick(); 1063201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = (i1 ? Base() : Derived()).trick(); 1073201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = (i1 ? Derived() : Base()).trick(); 1083201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // should fail: const lost 1093201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('struct Base' and 'struct Derived const')}} 1103201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('struct Derived const' and 'struct Base')}} 11178eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl 11278eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl // FIXME: these are invalid hierarchy conversions 11378eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl Priv priv; 11478eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl Fin fin; 1153201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Base() : Priv()); // xpected-error private base 1163201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Priv() : Base()); // xpected-error private base 1173201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Base() : Fin()); // xpected-error ambiguous base 1183201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Fin() : Base()); // xpected-error ambiguous base 119a5cd2cdd11179387aa01f43cb6d6af440e006553Sebastian Redl (void)(i1 ? base : priv); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}} 120a5cd2cdd11179387aa01f43cb6d6af440e006553Sebastian Redl (void)(i1 ? priv : base); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}} 121a5cd2cdd11179387aa01f43cb6d6af440e006553Sebastian Redl (void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}} 122a5cd2cdd11179387aa01f43cb6d6af440e006553Sebastian Redl (void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}} 1233201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 1243201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // b2.2 (non-hierarchy) 1253201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? I() : i1; 1263201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? i1 : I(); 1273201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl I i2(i1 ? I() : J()); 1283201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl I i3(i1 ? J() : I()); 1293201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // "the type [it] woud have if E2 were converted to an rvalue" 1303201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl vfn pfn = i1 ? F() : test; 1313201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl pfn = i1 ? test : F(); 1323201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // these are ambiguous - better messages would be nice 1333201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? A() : B()); // expected-error {{incompatible operand types}} 1343201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? B() : A()); // expected-error {{incompatible operand types}} 1353201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? 1 : Ambig()); // expected-error {{incompatible operand types}} 1363201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl (void)(i1 ? Ambig() : 1); // expected-error {{incompatible operand types}} 13776458501a8963fa11b91c9337a487de6871169b4Sebastian Redl // By the way, this isn't an lvalue: 13876458501a8963fa11b91c9337a487de6871169b4Sebastian Redl &(i1 ? i1 : i2); // expected-error {{address expression must be an lvalue or a function designator}} 1393201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 1403201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p4 (lvalue, same type) 14176458501a8963fa11b91c9337a487de6871169b4Sebastian Redl Fields flds; 14276458501a8963fa11b91c9337a487de6871169b4Sebastian Redl int &ir1 = i1 ? flds.i1 : flds.i2; 14376458501a8963fa11b91c9337a487de6871169b4Sebastian Redl (i1 ? flds.b1 : flds.i2) = 0; 14476458501a8963fa11b91c9337a487de6871169b4Sebastian Redl (i1 ? flds.i1 : flds.b2) = 0; 14576458501a8963fa11b91c9337a487de6871169b4Sebastian Redl (i1 ? flds.b1 : flds.b2) = 0; 1463201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 1473201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p5 (conversion to built-in types) 1483201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // GCC 4.3 fails these 1493201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl double d1 = i1 ? I() : K(); 1503201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl pfn = i1 ? F() : G(); 15176458501a8963fa11b91c9337a487de6871169b4Sebastian Redl DFnPtr pfm; 15278eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl pfm = i1 ? DFnPtr() : &Base::fn1; 15378eb874222b7653edf7182d0d899d717d5c592c1Sebastian Redl pfm = i1 ? &Base::fn1 : DFnPtr(); 1543201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl 1553201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // p6 (final conversions) 1563201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? i1 : ir1; 1573201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl int *pi1 = i1 ? &i1 : 0; 1583201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl pi1 = i1 ? 0 : &i1; 1593201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? i1 : EVal; 1603201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl i1 = i1 ? EVal : i1; 1613201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl d1 = i1 ? 'c' : 4.0; 1623201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl d1 = i1 ? 4.0 : 'c'; 163d1bd7fc4cd88f8790c56620d22560e19717f468aSebastian Redl Base *pb = i1 ? (Base*)0 : (Derived*)0; 164d1bd7fc4cd88f8790c56620d22560e19717f468aSebastian Redl pb = i1 ? (Derived*)0 : (Base*)0; 1659bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl pfm = i1 ? &Base::fn1 : &Derived::fn2; 1669bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl pfm = i1 ? &Derived::fn2 : &Base::fn1; 1679bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl pfm = i1 ? &Derived::fn2 : 0; 1689bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl pfm = i1 ? 0 : &Derived::fn2; 1699bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl const int (MixedFieldsDerived::*mp1) = 1709bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl i1 ? &MixedFields::ci : &MixedFieldsDerived::i; 1719bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl const volatile int (MixedFields::*mp2) = 1729bebfadb807aba0bc272197aff1cb4b2284c00a6Sebastian Redl i1 ? &MixedFields::ci : &MixedFields::cvi; 17320b3e9918cf7d7845c920baabc4fb2f1ac0ee1d2Douglas Gregor (void)(i1 ? &MixedFields::ci : &MixedFields::vi); 17476458501a8963fa11b91c9337a487de6871169b4Sebastian Redl // Conversion of primitives does not result in an lvalue. 17576458501a8963fa11b91c9337a487de6871169b4Sebastian Redl &(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}} 17676458501a8963fa11b91c9337a487de6871169b4Sebastian Redl 1771d524c3dde58e4402aab4165e85e9ae6f15f5023Anders Carlsson (void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}} 1781d524c3dde58e4402aab4165e85e9ae6f15f5023Anders Carlsson (void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}} 1791d524c3dde58e4402aab4165e85e9ae6f15f5023Anders Carlsson 1803201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // Note the thing that this does not test: since DR446, various situations 1813201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // *must* create a separate temporary copy of class objects. This can only 1823201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl // be properly tested at runtime, though. 1833201f6beec688ab9fe8750527e28f52d5420e22dSebastian Redl} 184