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}}
HasNonConstExprMemInitHasNonConstExprMemInit57   constexpr HasNonConstExprMemInit() {} // expected-error {{never produces a constant expression}}
HasNonConstExprMemInitHasNonConstExprMemInit58   constexpr HasNonConstExprMemInit(int y) : x(y) {} // ok
59 };
60 static_assert(__is_literal(HasNonConstExprMemInit), "fail");
61 
62 class HasConstExprCtor {
63   int x;
64 public:
HasConstExprCtor(int x)65   constexpr HasConstExprCtor(int x) : x(x) {}
66 };
67 template <typename T> class HasConstExprCtorTemplate {
68   T x;
69 public:
HasConstExprCtorTemplate(U y)70   template <typename U> constexpr HasConstExprCtorTemplate(U y) : x(y) {}
71 };
72 template <typename T> class HasConstExprCtorT {
HasConstExprCtorT(T)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