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+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
+
+struct NonLiteral { NonLiteral(); };
+
+// A type is a literal type if it is:
+
+// - a scalar type
+constexpr int f1(double);
+
+// - a reference type
+struct S { S(); };
+constexpr int f2(S &);
+
+// - a class type that has all of the following properties:
+
+// - it has a trivial destructor
+struct UserProvDtor {
+ constexpr UserProvDtor(); // expected-error {{non-literal type 'UserProvDtor' cannot have constexpr members}}
+ ~UserProvDtor(); // expected-note {{has a user-provided destructor}}
+};
+struct NonTrivDtor {
+ constexpr NonTrivDtor(); // expected-error {{non-literal type 'NonTrivDtor' cannot have constexpr members}}
+ virtual ~NonTrivDtor() = default; // expected-note {{has a non-trivial destructor}}
+};
+struct NonTrivDtorBase {
+ ~NonTrivDtorBase();
+};
+template<typename T>
+struct DerivedFromNonTrivDtor : T { // expected-note {{'DerivedFromNonTrivDtor<NonTrivDtorBase>' is not literal because it has base class 'NonTrivDtorBase' of non-literal type}}
+ constexpr DerivedFromNonTrivDtor();
+};
+constexpr int f(DerivedFromNonTrivDtor<NonTrivDtorBase>); // expected-error {{constexpr function's 1st parameter type 'DerivedFromNonTrivDtor<NonTrivDtorBase>' is not a literal type}}
+struct TrivDtor {
+ constexpr TrivDtor();
+};
+// FIXME: when building DefinitionData we look at 'isUserProvided' before it's set up!
+#if 0
+struct TrivDefaultedDtor {
+ constexpr TrivDefaultedDtor();
+ ~TrivDefaultedDtor() = default;
+};
+#endif
+
+// - it is an aggregate type or has at least one constexpr constructor or
+// constexpr constructor template that is not a copy or move constructor
+struct Agg {
+ int a;
+ char *b;
+};
+constexpr int f3(Agg a) { return a.a; }
+struct CtorTemplate {
+ template<typename T> constexpr CtorTemplate(T);
+};
+struct CopyCtorOnly { // expected-note {{'CopyCtorOnly' is not literal because it is not an aggregate and has no constexpr constructors other than copy or move constructors}}
+ constexpr CopyCtorOnly(CopyCtorOnly&); // expected-error {{non-literal type 'CopyCtorOnly' cannot have constexpr members}}
+};
+struct MoveCtorOnly { // expected-note {{no constexpr constructors other than copy or move constructors}}
+ constexpr MoveCtorOnly(MoveCtorOnly&&); // expected-error {{non-literal type 'MoveCtorOnly' cannot have constexpr members}}
+};
+template<typename T>
+struct CtorArg { // expected-note {{no constexpr constructors other than copy or move constructors}}
+ constexpr CtorArg(T); // expected-note {{constructor template instantiation is not constexpr because 1st parameter type 'NonLiteral' is not a literal type}}
+};
+constexpr int f(CtorArg<int>);
+constexpr int f(CtorArg<NonLiteral>); // expected-error {{not a literal type}}
+// We have a special-case diagnostic for classes with virtual base classes.
+struct VBase {};
+struct HasVBase : virtual VBase {}; // expected-note 2{{virtual base class declared here}}
+struct Derived : HasVBase {
+ constexpr Derived(); // expected-error {{constexpr constructor not allowed in struct with virtual base class}}
+};
+template<typename T> struct DerivedFromVBase : T { // expected-note {{struct with virtual base class is not a literal type}}
+ constexpr DerivedFromVBase();
+};
+constexpr int f(DerivedFromVBase<HasVBase>); // expected-error {{constexpr function's 1st parameter type 'DerivedFromVBase<HasVBase>' is not a literal type}}
+
+// - it has all non-static data members and base classes of literal types
+struct NonLitMember {
+ S s; // expected-note {{has data member 's' of non-literal type 'S'}}
+};
+constexpr int f(NonLitMember); // expected-error {{1st parameter type 'NonLitMember' is not a literal type}}
+struct NonLitBase :
+ S { // expected-note {{base class 'S' of non-literal type}}
+ constexpr NonLitBase(); // expected-error {{non-literal type 'NonLitBase' cannot have constexpr members}}
+};
+struct LitMemBase : Agg {
+ Agg agg;
+};
+template<typename T>
+struct MemberType {
+ T t; // expected-note {{'MemberType<NonLiteral>' is not literal because it has data member 't' of non-literal type 'NonLiteral'}}
+ constexpr MemberType();
+};
+constexpr int f(MemberType<int>);
+constexpr int f(MemberType<NonLiteral>); // expected-error {{not a literal type}}
+
+// - an array of literal type
+struct ArrGood {
+ Agg agg[24];
+ double d[12];
+ TrivDtor td[3];
+};
+constexpr int f(ArrGood);
+
+struct ArrBad {
+ S s[3]; // expected-note {{data member 's' of non-literal type 'S [3]'}}
+};
+constexpr int f(ArrBad); // expected-error {{1st parameter type 'ArrBad' is not a literal type}}
+
+
+// As a non-conforming tweak to the standard, we do not allow a literal type to
+// have any mutable data members.
+namespace MutableMembers {
+ struct MM {
+ mutable int n; // expected-note {{'MM' is not literal because it has a mutable data member}}
+ };
+ constexpr int f(MM); // expected-error {{not a literal type}}
+
+ // Here's one reason why allowing this would be a disaster...
+ template<int n> struct Id { int k = n; };
+ int f() {
+ // FIXME: correctly check whether the initializer is a constant expression.
+ constexpr MM m = { 0 }; // desired-error {{must be a constant expression}}
+ ++m.n;
+ return Id<m.n>().k; // expected-error {{not an integral constant expression}}
+ }
+}