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      1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
      2 
      3 static_assert(__is_literal(int), "fail");
      4 static_assert(__is_literal_type(int), "fail"); // alternate spelling for GCC
      5 static_assert(__is_literal(void*), "fail");
      6 enum E { E1 };
      7 static_assert(__is_literal(E), "fail");
      8 static_assert(__is_literal(decltype(E1)), "fail");
      9 typedef int IAR[10];
     10 static_assert(__is_literal(IAR), "fail");
     11 typedef int Vector __attribute__((vector_size(16)));
     12 typedef int VectorExt __attribute__((ext_vector_type(4)));
     13 static_assert(__is_literal(Vector), "fail");
     14 static_assert(__is_literal(VectorExt), "fail");
     15 
     16 // C++0x [basic.types]p10:
     17 //   A type is a literal type if it is:
     18 //    [...]
     19 //    -- a class type that has all of the following properties:
     20 //        -- it has a trivial destructor
     21 //        -- every constructor call and full-expression in the
     22 //           brace-or-equal-initializers for non-static data members (if an) is
     23 //           a constant expression,
     24 //        -- it is an aggregate type or has at least one constexpr constructor
     25 //           or constructor template that is not a copy or move constructor, and
     26 //           [DR1452 adds class types with trivial default constructors to
     27 //            this list]
     28 //        -- it has all non-static data members and base classes of literal
     29 //           types
     30 struct Empty {};
     31 struct LiteralType {
     32   int x;
     33   E e;
     34   IAR arr;
     35   Empty empty;
     36   int method();
     37 };
     38 struct HasDtor { ~HasDtor(); };
     39 
     40 class NonAggregate { int x; };
     41 struct NonLiteral { NonLiteral(); };
     42 struct HasNonLiteralBase : NonLiteral {};
     43 struct HasNonLiteralMember { HasDtor x; };
     44 
     45 static_assert(__is_literal(Empty), "fail");
     46 static_assert(__is_literal(LiteralType), "fail");
     47 static_assert(__is_literal(NonAggregate), "fail");
     48 static_assert(!__is_literal(NonLiteral), "fail");
     49 static_assert(!__is_literal(HasDtor), "fail");
     50 static_assert(!__is_literal(HasNonLiteralBase), "fail");
     51 static_assert(!__is_literal(HasNonLiteralMember), "fail");
     52 
     53 // DR1361 removes the brace-or-equal-initializer bullet so that we can allow:
     54 extern int f(); // expected-note {{here}}
     55 struct HasNonConstExprMemInit {
     56   int x = f(); // expected-note {{non-constexpr function}}
     57   constexpr HasNonConstExprMemInit() {} // expected-error {{never produces a constant expression}}
     58   constexpr HasNonConstExprMemInit(int y) : x(y) {} // ok
     59 };
     60 static_assert(__is_literal(HasNonConstExprMemInit), "fail");
     61 
     62 class HasConstExprCtor {
     63   int x;
     64 public:
     65   constexpr HasConstExprCtor(int x) : x(x) {}
     66 };
     67 template <typename T> class HasConstExprCtorTemplate {
     68   T x;
     69 public:
     70   template <typename U> constexpr HasConstExprCtorTemplate(U y) : x(y) {}
     71 };
     72 template <typename T> class HasConstExprCtorT {
     73   constexpr HasConstExprCtorT(T) {}
     74 };
     75 static_assert(__is_literal(HasConstExprCtor), "fail");
     76 static_assert(__is_literal(HasConstExprCtorTemplate<int>), "fail");
     77 static_assert(__is_literal(HasConstExprCtorT<NonLiteral>), "fail");
     78