| // RUN: %clang_cc1 -verify -std=c++11 %s |
| |
| namespace N { |
| typedef char C; |
| } |
| |
| namespace M { |
| typedef double D; |
| } |
| |
| struct NonLiteral { |
| NonLiteral() {} |
| NonLiteral(int) {} // expected-note 2{{here}} |
| operator int() const { return 0; } |
| }; |
| struct Literal { |
| constexpr Literal() {} |
| operator int() const { return 0; } |
| }; |
| |
| struct S { |
| virtual int ImplicitlyVirtual() const; |
| }; |
| struct T {}; |
| |
| template<typename T> struct ImplicitVirtualFromDependentBase : T { |
| constexpr int ImplicitlyVirtual() const { return 0; } |
| }; |
| |
| constexpr int a = ImplicitVirtualFromDependentBase<S>().ImplicitlyVirtual(); // expected-error {{constant expression}} expected-note {{cannot evaluate virtual function call}} |
| constexpr int b = ImplicitVirtualFromDependentBase<T>().ImplicitlyVirtual(); // ok |
| constexpr int c = ImplicitVirtualFromDependentBase<S>().ImplicitVirtualFromDependentBase<S>::ImplicitlyVirtual(); |
| |
| template<typename R> struct ConstexprMember { |
| constexpr R F() const { return 0; } |
| }; |
| constexpr int d = ConstexprMember<int>().F(); // ok |
| constexpr int e = ConstexprMember<NonLiteral>().F(); // expected-error {{constant expression}} expected-note {{non-literal type 'NonLiteral' cannot be used in a constant expression}} |
| |
| template<typename ...P> struct ConstexprCtor { |
| constexpr ConstexprCtor(P...) {} |
| }; |
| constexpr ConstexprCtor<> f1() { return {}; } // ok |
| constexpr ConstexprCtor<int> f2() { return 0; } // ok |
| constexpr ConstexprCtor<NonLiteral> f3() { return { 0 }; } // expected-error {{never produces a constant expression}} expected-note {{non-constexpr constructor 'NonLiteral}} |
| constexpr ConstexprCtor<int, NonLiteral> f4() { return { 0, 0 }; } // expected-error {{never produces a constant expression}} expected-note {{non-constexpr constructor 'NonLiteral}} |
| |
| struct VirtBase : virtual S {}; // expected-note {{here}} |
| |
| namespace TemplateVBase { |
| template<typename T> struct T1 : virtual Literal { // expected-note {{here}} |
| constexpr T1() {} // expected-error {{constexpr constructor not allowed in struct with virtual base class}} |
| }; |
| |
| template<typename T> struct T2 : virtual T { |
| // FIXME: This is ill-formed (no diagnostic required). |
| // We should diagnose it now rather than waiting until instantiation. |
| constexpr T2() {} |
| }; |
| constexpr T2<Literal> g2() { return {}; } |
| |
| template<typename T> class T3 : public T { // expected-note {{class with virtual base class is not a literal type}} |
| public: |
| constexpr T3() {} |
| }; |
| constexpr T3<Literal> g3() { return {}; } // ok |
| constexpr T3<VirtBase> g4() { return {}; } // expected-error {{not a literal type}} |
| } |