1 // RUN: %clang_cc1 -verify -std=c++11 %s 2 3 namespace RedeclAliasTypedef { 4 template<typename U> using T = int; 5 template<typename U> using T = int; 6 template<typename U> using T = T<U>; 7 } 8 9 namespace IllegalTypeIds { 10 template<typename U> using A = void(int n = 0); // expected-error {{default arguments can only be specified for parameters in a function declaration}} 11 template<typename U> using B = inline void(int n); // expected-error {{type name does not allow function specifier}} 12 template<typename U> using C = virtual void(int n); // expected-error {{type name does not allow function specifier}} 13 template<typename U> using D = explicit void(int n); // expected-error {{type name does not allow function specifier}} 14 template<typename U> using E = void(int n) throw(); // expected-error {{exception specifications are not allowed in type aliases}} 15 template<typename U> using F = void(*)(int n) &&; // expected-error {{pointer to function type cannot have '&&' qualifier}} 16 template<typename U> using G = __thread void(int n); // expected-error {{type name does not allow storage class to be specified}} 17 template<typename U> using H = constexpr int; // expected-error {{type name does not allow constexpr specifier}} 18 19 template<typename U> using Y = void(int n); // ok 20 template<typename U> using Z = void(int n) &&; // ok 21 } 22 23 namespace IllegalSyntax { 24 template<typename Z> using ::T = void(int n); // expected-error {{name defined in alias declaration must be an identifier}} 25 template<typename Z> using operator int = void(int n); // expected-error {{name defined in alias declaration must be an identifier}} 26 template<typename Z> using typename U = void; // expected-error {{name defined in alias declaration must be an identifier}} 27 template<typename Z> using typename ::V = void(int n); // expected-error {{name defined in alias declaration must be an identifier}} 28 template<typename Z> using typename ::operator bool = void(int n); // expected-error {{name defined in alias declaration must be an identifier}} 29 } 30 31 namespace VariableLengthArrays { 32 template<typename Z> using T = int[42]; // ok 33 34 int n = 32; 35 template<typename Z> using T = int[n]; // expected-error {{variable length array declaration not allowed at file scope}} 36 37 const int m = 42; 38 template<typename Z> using U = int[m]; // expected-note {{previous definition}} 39 template<typename Z> using U = int[42]; // ok 40 template<typename Z> using U = int; // expected-error {{type alias template redefinition with different types ('int' vs 'int [42]')}} 41 } 42 43 namespace RedeclFunc { 44 int f(int, char**); 45 template<typename Z> using T = int; 46 T<char> f(int, char **); // ok 47 } 48 49 namespace LookupFilter { 50 namespace N { template<typename U> using S = int; } 51 using namespace N; 52 template<typename U> using S = S<U>*; // ok 53 } 54 55 namespace InFunctions { 56 template<typename...T> struct S0 { 57 template<typename Z> using U = T*; // expected-error {{declaration type contains unexpanded parameter pack 'T'}} 58 U<char> u; 59 }; 60 61 template<typename Z> using T1 = int; 62 template<typename Z> using T2 = int[-1]; // expected-error {{array size is negative}} 63 template<typename...T> struct S3 { // expected-note {{template parameter is declared here}} 64 template<typename Z> using T = int; // expected-error {{declaration of 'T' shadows template parameter}} 65 }; 66 template<typename Z> using Z = Z; 67 } 68 69 namespace ClassNameRedecl { 70 class C0 { 71 // FIXME: this diagnostic is pretty poor 72 template<typename U> using C0 = int; // expected-error {{name defined in alias declaration must be an identifier}} 73 }; 74 class C1 { 75 // FIXME: this diagnostic is pretty poor 76 template<typename U> using C1 = C1; // expected-error {{name defined in alias declaration must be an identifier}} 77 }; 78 class C2 { 79 template<typename U> using C0 = C1; // ok 80 }; 81 template<typename...T> class C3 { 82 template<typename U> using f = T; // expected-error {{declaration type contains unexpanded parameter pack 'T'}} 83 }; 84 template<typename T> class C4 { // expected-note {{template parameter is declared here}} 85 template<typename U> using T = int; // expected-error {{declaration of 'T' shadows template parameter}} 86 }; 87 class C5 { 88 class c; // expected-note {{previous definition}} 89 template<typename U> using c = int; // expected-error {{redefinition of 'c' as different kind of symbol}} 90 class d; // expected-note {{previous definition}} 91 template<typename U> using d = d; // expected-error {{redefinition of 'd' as different kind of symbol}} 92 }; 93 class C6 { 94 class c { template<typename U> using C6 = int; }; // ok 95 }; 96 } 97 98 class CtorDtorName { 99 template<typename T> using X = CtorDtorName; 100 X<int>(); // expected-error {{expected member name}} 101 ~X<int>(); // expected-error {{destructor cannot be declared using a type alias}} 102 }; 103 104 namespace TagName { 105 template<typename Z> using S = struct { int n; }; // expected-error {{can not be defined}} 106 template<typename Z> using T = class { int n; }; // expected-error {{can not be defined}} 107 template<typename Z> using U = enum { a, b, c }; // expected-error {{can not be defined}} 108 template<typename Z> using V = struct V { int n; }; // expected-error {{redefinition of 'V' as different kind of symbol}} \ 109 expected-error {{'TagName::V' can not be defined in a type alias template}} \ 110 expected-note {{previous definition is here}} 111 } 112 113 namespace StdExample { 114 template<typename T, typename U> struct pair; 115 116 template<typename T> using handler_t = void (*)(T); 117 extern handler_t<int> ignore; 118 extern void (*ignore)(int); 119 // FIXME: we recover as if cell is an undeclared variable. the diagnostics are terrible! 120 template<typename T> using cell = pair<T*, cell<T>*>; // expected-error {{use of undeclared identifier 'cell'}} \ 121 expected-error {{'T' does not refer to a value}} \ 122 expected-note {{declared here}} \ 123 expected-error {{expected ';' after alias declaration}} 124 } 125 126 namespace Access { 127 class C0 { 128 template<typename Z> using U = int; // expected-note {{declared private here}} 129 }; 130 C0::U<int> v; // expected-error {{'U' is a private member}} 131 class C1 { 132 public: 133 template<typename Z> using U = int; 134 }; 135 C1::U<int> w; // ok 136 } 137 138 namespace VoidArg { 139 template<typename Z> using V = void; 140 V<int> f(int); // ok 141 V<char> g(V<double>); // expected-error {{empty parameter list defined with a type alias of 'void' not allowed}} 142 } 143 144 namespace Curried { 145 template<typename T, typename U> struct S; 146 template<typename T> template<typename U> using SS = S<T, U>; // expected-error {{extraneous template parameter list in alias template declaration}} 147 } 148