1 // RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -std=c++0x -Wall %s 2 3 template<bool b> struct ExceptionIf { static int f(); }; 4 template<> struct ExceptionIf<false> { typedef int f; }; 5 6 // The exception specification of a defaulted default constructor depends on 7 // the contents of in-class member initializers. However, the in-class member 8 // initializers can depend on the exception specification of the constructor, 9 // since the class is considered complete within them. We reject any such cases. 10 namespace InClassInitializers { 11 // Noexcept::Noexcept() is implicitly declared as noexcept(false), because it 12 // directly invokes ThrowSomething(). However... 13 // 14 // If noexcept(Noexcept()) is false, then Noexcept() is a constant expression, 15 // so noexcept(Noexcept()) is true. But if noexcept(Noexcept()) is true, then 16 // Noexcept::Noexcept is not declared constexpr, therefore noexcept(Noexcept()) 17 // is false. 18 bool ThrowSomething() noexcept(false); 19 struct ConstExpr { 20 bool b = noexcept(ConstExpr()) && ThrowSomething(); // expected-error {{exception specification is not available until end of class definition}} 21 }; 22 // We can use it now. 23 bool w = noexcept(ConstExpr()); 24 25 // Much more obviously broken: we can't parse the initializer without already 26 // knowing whether it produces a noexcept expression. 27 struct TemplateArg { 28 int n = ExceptionIf<noexcept(TemplateArg())>::f(); // expected-error {{exception specification is not available until end of class definition}} 29 }; 30 bool x = noexcept(TemplateArg()); 31 32 // And within a nested class. 33 struct Nested { 34 struct Inner { 35 int n = ExceptionIf<noexcept(Nested())>::f(); // expected-error {{exception specification is not available until end of class definition}} 36 } inner; 37 }; 38 bool y = noexcept(Nested()); 39 bool z = noexcept(Nested::Inner()); 40 } 41 42 // FIXME: 43 // The same problem arises in delayed parsing of exception specifications, 44 // which clang does not yet support. 45 namespace ExceptionSpecification { 46 struct Nested { // expected-note {{not complete}} 47 struct T { 48 T() noexcept(!noexcept(Nested())); // expected-error {{incomplete type}} 49 } t; 50 }; 51 } 52 53 // FIXME: 54 // The same problem arises in delayed parsing of default arguments, 55 // which clang does not yet support. 56 namespace DefaultArgument { 57 // FIXME: this diagnostic is completely wrong. 58 struct Default { // expected-note {{explicitly marked deleted here}} 59 struct T { 60 T(int = ExceptionIf<noexcept(Default())::f()); // expected-error {{call to deleted constructor}} 61 } t; 62 }; 63 } 64
