forked from OSchip/llvm-project
184 lines
6.5 KiB
C++
184 lines
6.5 KiB
C++
// RUN: clang-cc -fsyntax-only -verify -faccess-control -std=c++0x %s
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// C++ rules for ?: are a lot stricter than C rules, and have to take into
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// account more conversion options.
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// This test runs in C++0x mode for the contextual conversion of the condition.
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struct ToBool { explicit operator bool(); };
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struct B;
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struct A { A(); A(const B&); };
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struct B { operator A() const; };
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struct I { operator int(); };
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struct J { operator I(); };
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struct K { operator double(); };
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typedef void (*vfn)();
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struct F { operator vfn(); };
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struct G { operator vfn(); };
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struct Base {
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int trick();
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A trick() const;
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void fn1();
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};
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struct Derived : Base {
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void fn2();
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};
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struct Convertible { operator Base&(); };
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struct Priv : private Base {}; // expected-note 2 {{'private' inheritance specifier here}}
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struct Mid : Base {};
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struct Fin : Mid, Derived {};
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typedef void (Derived::*DFnPtr)();
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struct ToMemPtr { operator DFnPtr(); };
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struct BadDerived;
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struct BadBase { operator BadDerived&(); };
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struct BadDerived : BadBase {};
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struct Fields {
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int i1, i2, b1 : 3, b2 : 3;
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};
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struct MixedFields {
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int i;
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volatile int vi;
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const int ci;
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const volatile int cvi;
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};
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struct MixedFieldsDerived : MixedFields {
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};
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enum Enum { EVal };
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struct Ambig {
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operator short();
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operator signed char();
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};
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void test()
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{
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// This function tests C++0x 5.16
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// p1 (contextually convert to bool)
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int i1 = ToBool() ? 0 : 1;
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// p2 (one or both void, and throwing)
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i1 ? throw 0 : throw 1;
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i1 ? test() : throw 1;
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i1 ? throw 0 : test();
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i1 ? test() : test();
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i1 = i1 ? throw 0 : 0;
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i1 = i1 ? 0 : throw 0;
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i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}}
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i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}}
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(i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}}
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(i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}}
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// p3 (one or both class type, convert to each other)
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// b1 (lvalues)
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Base base;
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Derived derived;
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Convertible conv;
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Base &bar1 = i1 ? base : derived;
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Base &bar2 = i1 ? derived : base;
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Base &bar3 = i1 ? base : conv;
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Base &bar4 = i1 ? conv : base;
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// these are ambiguous
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BadBase bb;
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BadDerived bd;
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(void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'struct BadBase' can be converted to 'struct BadDerived' and vice versa}}
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(void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}}
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// curiously enough (and a defect?), these are not
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// for rvalues, hierarchy takes precedence over other conversions
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(void)(i1 ? BadBase() : BadDerived());
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(void)(i1 ? BadDerived() : BadBase());
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// b2.1 (hierarchy stuff)
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const Base constret();
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const Derived constder();
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// should use const overload
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A a1((i1 ? constret() : Base()).trick());
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A a2((i1 ? Base() : constret()).trick());
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A a3((i1 ? constret() : Derived()).trick());
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A a4((i1 ? Derived() : constret()).trick());
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// should use non-const overload
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i1 = (i1 ? Base() : Base()).trick();
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i1 = (i1 ? Base() : Base()).trick();
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i1 = (i1 ? Base() : Derived()).trick();
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i1 = (i1 ? Derived() : Base()).trick();
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// should fail: const lost
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(void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('struct Base' and 'struct Derived const')}}
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(void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('struct Derived const' and 'struct Base')}}
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// FIXME: these are invalid hierarchy conversions
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Priv priv;
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Fin fin;
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(void)(i1 ? Base() : Priv()); // xpected-error private base
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(void)(i1 ? Priv() : Base()); // xpected-error private base
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(void)(i1 ? Base() : Fin()); // xpected-error ambiguous base
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(void)(i1 ? Fin() : Base()); // xpected-error ambiguous base
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(void)(i1 ? base : priv); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}}
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(void)(i1 ? priv : base); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}}
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(void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}}
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(void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}}
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// b2.2 (non-hierarchy)
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i1 = i1 ? I() : i1;
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i1 = i1 ? i1 : I();
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I i2(i1 ? I() : J());
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I i3(i1 ? J() : I());
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// "the type [it] woud have if E2 were converted to an rvalue"
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vfn pfn = i1 ? F() : test;
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pfn = i1 ? test : F();
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// these are ambiguous - better messages would be nice
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(void)(i1 ? A() : B()); // expected-error {{incompatible operand types}}
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(void)(i1 ? B() : A()); // expected-error {{incompatible operand types}}
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(void)(i1 ? 1 : Ambig()); // expected-error {{incompatible operand types}}
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(void)(i1 ? Ambig() : 1); // expected-error {{incompatible operand types}}
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// By the way, this isn't an lvalue:
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&(i1 ? i1 : i2); // expected-error {{address expression must be an lvalue or a function designator}}
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// p4 (lvalue, same type)
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Fields flds;
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int &ir1 = i1 ? flds.i1 : flds.i2;
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(i1 ? flds.b1 : flds.i2) = 0;
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(i1 ? flds.i1 : flds.b2) = 0;
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(i1 ? flds.b1 : flds.b2) = 0;
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// p5 (conversion to built-in types)
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// GCC 4.3 fails these
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double d1 = i1 ? I() : K();
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pfn = i1 ? F() : G();
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DFnPtr pfm;
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pfm = i1 ? DFnPtr() : &Base::fn1;
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pfm = i1 ? &Base::fn1 : DFnPtr();
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// p6 (final conversions)
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i1 = i1 ? i1 : ir1;
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int *pi1 = i1 ? &i1 : 0;
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pi1 = i1 ? 0 : &i1;
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i1 = i1 ? i1 : EVal;
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i1 = i1 ? EVal : i1;
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d1 = i1 ? 'c' : 4.0;
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d1 = i1 ? 4.0 : 'c';
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Base *pb = i1 ? (Base*)0 : (Derived*)0;
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pb = i1 ? (Derived*)0 : (Base*)0;
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pfm = i1 ? &Base::fn1 : &Derived::fn2;
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pfm = i1 ? &Derived::fn2 : &Base::fn1;
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pfm = i1 ? &Derived::fn2 : 0;
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pfm = i1 ? 0 : &Derived::fn2;
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const int (MixedFieldsDerived::*mp1) =
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i1 ? &MixedFields::ci : &MixedFieldsDerived::i;
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const volatile int (MixedFields::*mp2) =
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i1 ? &MixedFields::ci : &MixedFields::cvi;
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(void)(i1 ? &MixedFields::ci : &MixedFields::vi);
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// Conversion of primitives does not result in an lvalue.
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&(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}}
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(void)&(i1 ? flds.b1 : flds.i1); // expected-error {{address of bit-field requested}}
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(void)&(i1 ? flds.i1 : flds.b1); // expected-error {{address of bit-field requested}}
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// Note the thing that this does not test: since DR446, various situations
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// *must* create a separate temporary copy of class objects. This can only
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// be properly tested at runtime, though.
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}
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