1 files changed, 181 insertions, 0 deletions
diff --git a/test/SemaCXX/conditional-expr.cpp b/test/SemaCXX/conditional-expr.cpp
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+++ b/test/SemaCXX/conditional-expr.cpp
@@ -0,0 +1,181 @@
+// RUN: clang-cc -fsyntax-only -verify -faccess-control -std=c++0x %s
+
+// C++ rules for ?: are a lot stricter than C rules, and have to take into
+// account more conversion options.
+// This test runs in C++0x mode for the contextual conversion of the condition.
+
+struct ToBool { explicit operator bool(); };
+
+struct B;
+struct A { A(); A(const B&); };
+struct B { operator A() const; };
+struct I { operator int(); };
+struct J { operator I(); };
+struct K { operator double(); };
+typedef void (*vfn)();
+struct F { operator vfn(); };
+struct G { operator vfn(); };
+
+struct Base {
+  int trick();
+  A trick() const;
+  void fn1();
+};
+struct Derived : Base {
+  void fn2();
+};
+struct Convertible { operator Base&(); };
+struct Priv : private Base {}; // expected-note 2 {{'private' inheritance specifier here}}
+struct Mid : Base {};
+struct Fin : Mid, Derived {};
+typedef void (Derived::*DFnPtr)();
+struct ToMemPtr { operator DFnPtr(); };
+
+struct BadDerived;
+struct BadBase { operator BadDerived&(); };
+struct BadDerived : BadBase {};
+
+struct Fields {
+  int i1, i2, b1 : 3, b2 : 3;
+};
+struct MixedFields {
+  int i;
+  volatile int vi;
+  const int ci;
+  const volatile int cvi;
+};
+struct MixedFieldsDerived : MixedFields {
+};
+
+enum Enum { EVal };
+
+struct Ambig {
+  operator short();
+  operator signed char();
+};
+
+void test()
+{
+  // This function tests C++0x 5.16
+
+  // p1 (contextually convert to bool)
+  int i1 = ToBool() ? 0 : 1;
+
+  // p2 (one or both void, and throwing)
+  i1 ? throw 0 : throw 1;
+  i1 ? test() : throw 1;
+  i1 ? throw 0 : test();
+  i1 ? test() : test();
+  i1 = i1 ? throw 0 : 0;
+  i1 = i1 ? 0 : throw 0;
+  i1 ? 0 : test(); // expected-error {{right operand to ? is void, but left operand is of type 'int'}}
+  i1 ? test() : 0; // expected-error {{left operand to ? is void, but right operand is of type 'int'}}
+  (i1 ? throw 0 : i1) = 0; // expected-error {{expression is not assignable}}
+  (i1 ? i1 : throw 0) = 0; // expected-error {{expression is not assignable}}
+
+  // p3 (one or both class type, convert to each other)
+  // b1 (lvalues)
+  Base base;
+  Derived derived;
+  Convertible conv;
+  Base &bar1 = i1 ? base : derived;
+  Base &bar2 = i1 ? derived : base;
+  Base &bar3 = i1 ? base : conv;
+  Base &bar4 = i1 ? conv : base;
+  // these are ambiguous
+  BadBase bb;
+  BadDerived bd;
+  (void)(i1 ? bb : bd); // expected-error {{conditional expression is ambiguous; 'struct BadBase' can be converted to 'struct BadDerived' and vice versa}}
+  (void)(i1 ? bd : bb); // expected-error {{conditional expression is ambiguous}}
+  // curiously enough (and a defect?), these are not
+  // for rvalues, hierarchy takes precedence over other conversions
+  (void)(i1 ? BadBase() : BadDerived());
+  (void)(i1 ? BadDerived() : BadBase());
+
+  // b2.1 (hierarchy stuff)
+  const Base constret();
+  const Derived constder();
+  // should use const overload
+  A a1((i1 ? constret() : Base()).trick());
+  A a2((i1 ? Base() : constret()).trick());
+  A a3((i1 ? constret() : Derived()).trick());
+  A a4((i1 ? Derived() : constret()).trick());
+  // should use non-const overload
+  i1 = (i1 ? Base() : Base()).trick();
+  i1 = (i1 ? Base() : Base()).trick();
+  i1 = (i1 ? Base() : Derived()).trick();
+  i1 = (i1 ? Derived() : Base()).trick();
+  // should fail: const lost
+  (void)(i1 ? Base() : constder()); // expected-error {{incompatible operand types ('struct Base' and 'struct Derived const')}}
+  (void)(i1 ? constder() : Base()); // expected-error {{incompatible operand types ('struct Derived const' and 'struct Base')}}
+
+  // FIXME: these are invalid hierarchy conversions
+  Priv priv;
+  Fin fin;
+  (void)(i1 ? Base() : Priv()); // xpected-error private base
+  (void)(i1 ? Priv() : Base()); // xpected-error private base
+  (void)(i1 ? Base() : Fin()); // xpected-error ambiguous base
+  (void)(i1 ? Fin() : Base()); // xpected-error ambiguous base
+  (void)(i1 ? base : priv); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}}
+  (void)(i1 ? priv : base); // expected-error {{conversion from 'struct Priv' to inaccessible base class 'struct Base'}}
+  (void)(i1 ? base : fin); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}}
+  (void)(i1 ? fin : base); // expected-error {{ambiguous conversion from derived class 'struct Fin' to base class 'struct Base'}}
+
+  // b2.2 (non-hierarchy)
+  i1 = i1 ? I() : i1;
+  i1 = i1 ? i1 : I();
+  I i2(i1 ? I() : J());
+  I i3(i1 ? J() : I());
+  // "the type [it] woud have if E2 were converted to an rvalue"
+  vfn pfn = i1 ? F() : test;
+  pfn = i1 ? test : F();
+  // these are ambiguous - better messages would be nice
+  (void)(i1 ? A() : B()); // expected-error {{incompatible operand types}}
+  (void)(i1 ? B() : A()); // expected-error {{incompatible operand types}}
+  (void)(i1 ? 1 : Ambig()); // expected-error {{incompatible operand types}}
+  (void)(i1 ? Ambig() : 1); // expected-error {{incompatible operand types}}
+  // By the way, this isn't an lvalue:
+  &(i1 ? i1 : i2); // expected-error {{address expression must be an lvalue or a function designator}}
+
+  // p4 (lvalue, same type)
+  Fields flds;
+  int &ir1 = i1 ? flds.i1 : flds.i2;
+  (i1 ? flds.b1 : flds.i2) = 0;
+  (i1 ? flds.i1 : flds.b2) = 0;
+  (i1 ? flds.b1 : flds.b2) = 0;
+
+  // p5 (conversion to built-in types)
+  // GCC 4.3 fails these
+  double d1 = i1 ? I() : K();
+  pfn = i1 ? F() : G();
+  DFnPtr pfm;
+  pfm = i1 ? DFnPtr() : &Base::fn1;
+  pfm = i1 ? &Base::fn1 : DFnPtr();
+
+  // p6 (final conversions)
+  i1 = i1 ? i1 : ir1;
+  int *pi1 = i1 ? &i1 : 0;
+  pi1 = i1 ? 0 : &i1;
+  i1 = i1 ? i1 : EVal;
+  i1 = i1 ? EVal : i1;
+  d1 = i1 ? 'c' : 4.0;
+  d1 = i1 ? 4.0 : 'c';
+  Base *pb = i1 ? (Base*)0 : (Derived*)0;
+  pb = i1 ? (Derived*)0 : (Base*)0;
+  pfm = i1 ? &Base::fn1 : &Derived::fn2;
+  pfm = i1 ? &Derived::fn2 : &Base::fn1;
+  pfm = i1 ? &Derived::fn2 : 0;
+  pfm = i1 ? 0 : &Derived::fn2;
+  const int (MixedFieldsDerived::*mp1) =
+    i1 ? &MixedFields::ci : &MixedFieldsDerived::i;
+  const volatile int (MixedFields::*mp2) =
+    i1 ? &MixedFields::ci : &MixedFields::cvi;
+  i1 ? &MixedFields::ci : &MixedFields::vi; // expected-error {{incompatible operand types}}
+  // Conversion of primitives does not result in an lvalue.
+  &(i1 ? i1 : d1); // expected-error {{address expression must be an lvalue or a function designator}}
+
+
+  // Note the thing that this does not test: since DR446, various situations
+  // *must* create a separate temporary copy of class objects. This can only
+  // be properly tested at runtime, though.
+}