clang/test/SemaTemplate/typename-specifier.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wno-unused
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wno-unused -fms-compatibility -DMSVC
   3 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s -Wno-unused
   4 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s -Wno-unused -fms-compatibility -DMSVC
   5 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s -Wno-unused
   6 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s -Wno-unused -fms-compatibility -DMSVC
   7 namespace N {
   8   struct A {
   9     typedef int type;
  10   };
  11
  12   struct B {
  13   };
  14
  15   struct C {
  16     struct type { };
  17     int type; // expected-note 2{{referenced member 'type' is declared here}}
  18   };
  19 }
  20
  21 int i;
  22
  23 typename N::A::type *ip1 = &i;
  24 #if __cplusplus <= 199711L // C++03 or earlier modes
  25 // expected-warning@-2 {{'typename' occurs outside of a template}}
  26 #endif
  27 typename N::B::type *ip2 = &i; // expected-error{{no type named 'type' in 'N::B'}}
  28 #if __cplusplus <= 199711L
  29 // expected-warning@-2 {{'typename' occurs outside of a template}}
  30 #endif
  31 typename N::C::type *ip3 = &i; // expected-error{{typename specifier refers to non-type member 'type'}}
  32 #if __cplusplus <= 199711L
  33 // expected-warning@-2 {{'typename' occurs outside of a template}}
  34 #endif
  35
  36 void test(double d) {
  37   typename N::A::type f(typename N::A::type(a)); // expected-warning{{disambiguated as a function declaration}}
  38   // expected-note@-1 {{add a pair of parentheses}}
  39 #if __cplusplus <= 199711L
  40   // expected-warning@-3 2{{'typename' occurs outside of a template}}
  41 #endif
  42   int five = f(5);
  43
  44   using namespace N;
  45   for (typename A::type i = 0; i < 10; ++i)
  46 #if __cplusplus <= 199711L
  47 // expected-warning@-2 {{'typename' occurs outside of a template}}
  48 #endif
  49     five += 1;
  50
  51   const typename N::A::type f2(d);
  52 #if __cplusplus <= 199711L
  53 // expected-warning@-2 {{'typename' occurs outside of a template}}
  54 #endif
  55 }
  56
  57 namespace N {
  58   template<typename T>
  59   struct X {
  60     typedef typename T::type type; // expected-error {{no type named 'type' in 'N::B'}} \
  61     // expected-error {{no type named 'type' in 'B'}} \
  62     // FIXME: location info for error above isn't very good \
  63     // expected-error 2{{typename specifier refers to non-type member 'type'}} \
  64     // expected-error{{type 'int' cannot be used prior to '::' because it has no members}}
  65   };
  66 }
  67
  68 N::X<N::A>::type *ip4 = &i;
  69 N::X<N::B>::type *ip5 = &i; // expected-note{{in instantiation of template class 'N::X<N::B>' requested here}}
  70 N::X<N::C>::type *ip6 = &i; // expected-note{{in instantiation of template class 'N::X<N::C>' requested here}}
  71
  72 N::X<int>::type fail1; // expected-note{{in instantiation of template class 'N::X<int>' requested here}}
  73
  74 template<typename T>
  75 struct Y {
  76   typedef typename N::X<T>::type *type; // expected-note{{in instantiation of template class 'N::X<B>' requested here}} \
  77   // expected-note{{in instantiation of template class 'N::X<C>' requested here}}
  78 };
  79
  80 struct A {
  81   typedef int type;
  82 };
  83
  84 struct B {
  85 };
  86
  87 struct C {
  88   struct type { };
  89   int type; // expected-note{{referenced member 'type' is declared here}}
  90 };
  91
  92 ::Y<A>::type ip7 = &i;
  93 ::Y<B>::type ip8 = &i; // expected-note{{in instantiation of template class 'Y<B>' requested here}}
  94 ::Y<C>::type ip9 = &i; // expected-note{{in instantiation of template class 'Y<C>' requested here}}
  95
  96 template<typename T> struct D {
  97   typedef typename T::foo foo;  // expected-error {{type 'long' cannot be used prior to '::' because it has no members}}
  98   typedef typename foo::bar bar;
  99 };
 100
 101 D<long> struct_D;  // expected-note {{in instantiation of template class 'D<long>' requested here}}
 102
 103 template<typename T> struct E {
 104   typedef typename T::foo foo;
 105   typedef typename foo::bar bar;  // expected-error {{type 'E<F>::foo' (aka 'double') cannot be used prior to '::' because it has no members}}
 106 };
 107
 108 struct F {
 109   typedef double foo;
 110 };
 111
 112 E<F> struct_E; // expected-note {{in instantiation of template class 'E<F>' requested here}}
 113
 114 template<typename T> struct G {
 115   typedef typename T::foo foo;
 116   typedef typename foo::bar bar;
 117 };
 118
 119 struct H {
 120   struct foo {
 121     typedef double bar;
 122   };
 123 };
 124
 125 G<H> struct_G;
 126
 127 namespace PR10925 {
 128   template< int mydim, typename Traits >
 129   class BasicGeometry
 130   {
 131     typedef int some_type_t;
 132   };
 133
 134   template<class ctype, int mydim, int coorddim>
 135   class MockGeometry : BasicGeometry<mydim, int>{
 136     using typename BasicGeometry<mydim, int>::operator[]; // expected-error {{typename is allowed for identifiers only}}
 137   };
 138 }
 139
 140
 141 namespace missing_typename {
 142 template <class T1, class T2> struct pair {}; // expected-note 7 {{template parameter is declared here}}
 143
 144 template <class T1, class T2>
 145 struct map {
 146   typedef T1* iterator;
 147 };
 148
 149 template <class T>
 150 class ExampleClass1 {
 151   struct ExampleItem;
 152
 153
 154   struct ExampleItemSet {
 155     typedef ExampleItem* iterator;
 156     ExampleItem* operator[](unsigned);
 157   };
 158
 159   void foo() {
 160 #ifdef MSVC
 161     // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 162 #else
 163     // expected-error@+2 {{template argument for template type parameter must be a type; did you forget 'typename'?}}
 164 #endif
 165     pair<ExampleItemSet::iterator, int> i;
 166     pair<this->ExampleItemSet::iterator, int> i; // expected-error-re {{template argument for template type parameter must be a type{{$}}}}
 167     pair<ExampleItemSet::operator[], int> i; // expected-error-re {{template argument for template type parameter must be a type{{$}}}}
 168   }
 169 #ifdef MSVC
 170     // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 171 #else
 172   // expected-error@+2 {{template argument for template type parameter must be a type; did you forget 'typename'?}}
 173 #endif
 174   pair<ExampleItemSet::iterator, int> elt;
 175
 176
 177   typedef map<int, ExampleItem*> ExampleItemMap;
 178
 179   static void bar() {
 180 #ifdef MSVC
 181     // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 182 #else
 183     // expected-error@+2 {{template argument for template type parameter must be a type; did you forget 'typename'?}}
 184 #endif
 185     pair<ExampleItemMap::iterator, int> i;
 186   }
 187 #ifdef MSVC
 188     // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 189 #else
 190   // expected-error@+2 {{template argument for template type parameter must be a type; did you forget 'typename'?}}
 191 #endif
 192   pair<ExampleItemMap::iterator, int> entry;
 193   pair<bar, int> foobar; // expected-error {{template argument for template type parameter must be a type}}
 194 };
 195 } // namespace missing_typename
 196
 197 namespace missing_typename_and_base {
 198 template <class T> struct Bar {}; // expected-note 1+ {{template parameter is declared here}}
 199 template <typename T>
 200 struct Foo : T {
 201
 202   // FIXME: MSVC accepts this code.
 203   Bar<TypeInBase> x; // expected-error {{use of undeclared identifier 'TypeInBase'}}
 204
 205 #ifdef MSVC
 206   // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 207 #else
 208   // expected-error@+2 {{must be a type; did you forget 'typename'?}}
 209 #endif
 210   Bar<T::TypeInBase> y;
 211
 212 #ifdef MSVC
 213   // expected-warning@+4 {{omitted 'typename' is a Microsoft extension}}
 214 #else
 215   // expected-error@+2 {{must be a type; did you forget 'typename'?}}
 216 #endif
 217   Bar<T::NestedRD::TypeInNestedRD> z;
 218
 219 };
 220 struct Base {
 221   typedef int TypeInBase;
 222   struct NestedRD {
 223     typedef int TypeInNestedRD;
 224   };
 225 };
 226 Foo<Base> x;
 227 } // namespace missing_typename_and_base
 228
 229 namespace func_type_vs_construct_tmp {
 230 template <typename> struct S { typedef int type; };
 231 template <typename T> void f();
 232 template <int N> void f();
 233
 234 // expected-error@+1 {{missing 'typename' prior to dependent type name 'S<int>::type'}}
 235 template <typename T> void g() { f</*typename*/ S<T>::type(int())>(); }
 236
 237 // Adding typename does fix the diagnostic.
 238 template <typename T> void h() { f<typename S<T>::type(int())>(); }
 239
 240 void j() {
 241   g<int>(); // expected-note-re {{in instantiation {{.*}} requested here}}
 242   h<int>();
 243 }
 244 } // namespace func_type_vs_construct_tmp
 245
 246 namespace pointer_vs_multiply {
 247 int x;
 248 // expected-error@+1 {{missing 'typename' prior to dependent type name 'B::type_or_int'}}
 249 template <typename T> void g() { T::type_or_int * x; }
 250 // expected-error@+1 {{typename specifier refers to non-type member 'type_or_int' in 'pointer_vs_multiply::A'}}
 251 template <typename T> void h() { typename T::type_or_int * x; }
 252
 253 struct A { static const int type_or_int = 5; }; // expected-note {{referenced member 'type_or_int' is declared here}}
 254 struct B { typedef int type_or_int; };
 255
 256 void j() {
 257   g<A>();
 258   g<B>(); // expected-note-re {{in instantiation {{.*}} requested here}}
 259   h<A>(); // expected-note-re {{in instantiation {{.*}} requested here}}
 260   h<B>();
 261 }
 262 } // namespace pointer_vs_multiply