clang/test/SemaCXX/enum-scoped.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -pedantic -std=c++11 -verify -triple x86_64-apple-darwin %s
   2 // RUN: %clang_cc1 -fsyntax-only -pedantic -std=c++17 -verify -triple x86_64-apple-darwin %s
   3
   4 enum class E1 {
   5   Val1 = 1L
   6 };
   7
   8 enum struct E2 {
   9   Val1 = '\0'
  10 };
  11
  12 E1 v1 = Val1; // expected-error{{undeclared identifier}}
  13 E1 v2 = E1::Val1;
  14
  15 static_assert(sizeof(E1) == sizeof(int), "bad size");
  16 static_assert(sizeof(E1::Val1) == sizeof(int), "bad size");
  17 static_assert(sizeof(E2) == sizeof(int), "bad size");
  18 static_assert(sizeof(E2::Val1) == sizeof(int), "bad size");
  19
  20 E1 v3 = E2::Val1; // expected-error{{cannot initialize a variable}}
  21 int x1 = E1::Val1; // expected-error{{cannot initialize a variable}}
  22
  23 enum E3 : char {
  24   Val2 = 1
  25 };
  26
  27 E3 v4 = Val2;
  28 E1 v5 = Val2; // expected-error{{cannot initialize a variable}}
  29
  30 static_assert(sizeof(E3) == 1, "bad size");
  31
  32 int x2 = Val2;
  33
  34 int a1[Val2];
  35 int a2[E1::Val1];
  36
  37 #if __cplusplus >= 201703L
  38 // expected-error@-3 {{type 'E1' is not implicitly convertible to 'unsigned long'}}
  39 #else
  40 // expected-error@-5 {{size of array has non-integer type}}
  41 #endif
  42
  43 int* p1 = new int[Val2];
  44 int* p2 = new int[E1::Val1];
  45
  46 #if __cplusplus >= 201703L
  47 // expected-error@-3 {{converting 'E1' to incompatible type 'unsigned long'}}
  48 #else
  49 // expected-error@-5 {{array size expression must have integral or unscoped enumeration type, not 'E1'}}
  50 #endif
  51
  52 enum class E4 {
  53   e1 = -2147483648, // ok
  54   e2 = 2147483647, // ok
  55   e3 = 2147483648 // expected-error{{enumerator value evaluates to 2147483648, which cannot be narrowed to type 'int'}}
  56 };
  57
  58 enum class E5 {
  59   e1 = 2147483647, // ok
  60   e2 // expected-error{{2147483648 is not representable in the underlying}}
  61 };
  62
  63 enum class E6 : bool {
  64     e1 = false, e2 = true,
  65     e3 // expected-error{{2 is not representable in the underlying}}
  66 };
  67
  68 enum E7 : bool {
  69     e1 = false, e2 = true,
  70     e3 // expected-error{{2 is not representable in the underlying}}
  71 };
  72
  73 template <class T>
  74 struct X {
  75   enum E : T {
  76     e1, e2,
  77     e3 // expected-error{{2 is not representable in the underlying}}
  78   };
  79 };
  80
  81 X<bool> X2; // expected-note{{in instantiation of template}}
  82
  83 enum Incomplete1; // expected-error{{C++ forbids forward references}}
  84
  85 enum Complete1 : int;
  86 Complete1 complete1;
  87
  88 enum class Complete2;
  89 Complete2 complete2;
  90
  91 // All the redeclarations below are done twice on purpose. Tests that the type
  92 // of the declaration isn't changed.
  93
  94 enum class Redeclare2; // expected-note{{previous declaration is here}} expected-note{{previous declaration is here}}
  95 enum Redeclare2; // expected-error{{previously declared as scoped}}
  96 enum Redeclare2; // expected-error{{previously declared as scoped}}
  97
  98 enum Redeclare3 : int; // expected-note{{previous declaration is here}} expected-note{{previous declaration is here}}
  99 enum Redeclare3; // expected-error{{previously declared with fixed underlying type}}
 100 enum Redeclare3; // expected-error{{previously declared with fixed underlying type}}
 101
 102 enum class Redeclare5;
 103 enum class Redeclare5 : int; // ok
 104
 105 enum Redeclare6 : int;   // expected-note{{previous declaration is here}} expected-note{{previous declaration is here}}
 106 enum Redeclare6 : short; // expected-error{{redeclared with different underlying type}}
 107 enum Redeclare6 : short; // expected-error{{redeclared with different underlying type}}
 108
 109 enum class Redeclare7;         // expected-note{{previous declaration is here}} expected-note{{previous declaration is here}}
 110 enum class Redeclare7 : short; // expected-error{{redeclared with different underlying type}}
 111 enum class Redeclare7 : short; // expected-error{{redeclared with different underlying type}}
 112
 113 enum : long {
 114   long_enum_val = 10000
 115 };
 116
 117 enum : long x; // expected-error{{unnamed enumeration must be a definition}}
 118
 119 void PR9333() {
 120   enum class scoped_enum { yes, no, maybe };
 121   scoped_enum e = scoped_enum::yes;
 122   if (e == scoped_enum::no) { }
 123 }
 124
 125 // <rdar://problem/9366066>
 126 namespace rdar9366066 {
 127   enum class X : unsigned { value };
 128
 129   void f(X x) {
 130     x % X::value; // expected-error{{invalid operands to binary expression ('X' and 'rdar9366066::X')}}
 131     x % 8; // expected-error{{invalid operands to binary expression ('X' and 'int')}}
 132   }
 133 }
 134
 135 // Part 1 of PR10264
 136 namespace test5 {
 137   namespace ns {
 138     typedef unsigned Atype;
 139     enum A : Atype;
 140   }
 141   enum ns::A : ns::Atype {
 142     x, y, z
 143   };
 144 }
 145
 146 // Part 2 of PR10264
 147 namespace test6 {
 148   enum A : unsigned;
 149   struct A::a; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
 150   enum A::b; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
 151   int A::c; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
 152   void A::d(); // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
 153   void test() {
 154     (void) A::e; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
 155   }
 156 }
 157
 158 namespace PR11484 {
 159   const int val = 104;
 160   enum class test1 { owner_dead = val, };
 161 }
 162
 163 namespace N2764 {
 164   enum class E *x0a; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}
 165   enum E2 *x0b; // OK
 166   enum class E { a, b };
 167   enum E x1 = E::a; // ok
 168   enum class E x2 = E::a; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}
 169
 170   enum F { a, b };
 171   enum F y1 = a; // ok
 172   enum class F y2 = a; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}
 173
 174   struct S {
 175     friend enum class E; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}
 176     friend enum class F; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}
 177
 178     friend enum G {}; // expected-error {{forward reference}} expected-error {{cannot define a type in a friend declaration}}
 179     friend enum class H {}; // expected-error {{forward reference}} expected-error {{cannot define a type in a friend declaration}}
 180     friend enum I : int {}; // expected-error {{forward reference}} expected-error {{cannot define a type in a friend declaration}}
 181
 182     enum A : int;
 183     A a;
 184   } s;
 185
 186   enum S::A : int {};
 187
 188   enum class B;
 189 }
 190
 191 enum class N2764::B {};
 192
 193 namespace PR12106 {
 194   template<typename E> struct Enum {
 195     Enum() : m_e(E::Last) {}
 196     E m_e;
 197   };
 198
 199   enum eCOLORS { Last };
 200   Enum<eCOLORS> e;
 201 }
 202
 203 namespace test7 {
 204   enum class E { e = (struct S*)0 == (struct S*)0 };
 205   S *p;
 206 }
 207
 208 namespace test8 {
 209   template<typename T> struct S {
 210     enum A : int; // expected-note {{here}}
 211     enum class B; // expected-note {{here}}
 212     enum class C : int; // expected-note {{here}}
 213     enum class D : int; // expected-note {{here}}
 214   };
 215   template<typename T> enum S<T>::A { a }; // expected-error {{previously declared with fixed underlying type}}
 216   template<typename T> enum class S<T>::B : char { b }; // expected-error {{redeclared with different underlying}}
 217   template<typename T> enum S<T>::C : int { c }; // expected-error {{previously declared as scoped}}
 218   template<typename T> enum class S<T>::D : char { d }; // expected-error {{redeclared with different underlying}}
 219 }
 220
 221 namespace test9 {
 222   template<typename T> struct S {
 223     enum class ET : T; // expected-note 2{{here}}
 224     enum class Eint : int; // expected-note 2{{here}}
 225   };
 226   template<> enum class S<int>::ET : int {};
 227   template<> enum class S<char>::ET : short {}; // expected-error {{different underlying type}}
 228   template<> enum class S<int>::Eint : short {}; // expected-error {{different underlying type}}
 229   template<> enum class S<char>::Eint : int {};
 230
 231   template<typename T> enum class S<T>::ET : int {}; // expected-error {{different underlying type 'int' (was 'short')}}
 232   template<typename T> enum class S<T>::Eint : T {}; // expected-error {{different underlying type 'short' (was 'int')}}
 233
 234   // The implicit instantiation of S<short> causes the implicit instantiation of
 235   // all declarations of member enumerations, so is ill-formed, even though we
 236   // never instantiate the definitions of S<short>::ET nor S<short>::Eint.
 237   S<short> s; // expected-note {{in instantiation of}}
 238 }
 239
 240 namespace test10 {
 241   template<typename T> int f() {
 242     enum E : int;
 243     enum E : T; // expected-note {{here}}
 244     E x;
 245     enum E : int { e }; // expected-error {{different underlying}}
 246     x = e;
 247     return x;
 248   }
 249   int k = f<int>();
 250   int l = f<short>(); // expected-note {{here}}
 251
 252   template<typename T> int g() {
 253     enum class E : int;
 254     enum class E : T; // expected-note {{here}}
 255     E x;
 256     enum class E : int { e }; // expected-error {{different underlying}}
 257     x = E::e;
 258     return (int)x;
 259   }
 260   int m = g<int>();
 261   int n = g<short>(); // expected-note {{here}}
 262 }
 263
 264 namespace pr13128 {
 265   // This should compile cleanly
 266   class C {
 267     enum class E { C };
 268   };
 269 }
 270
 271 namespace PR15633 {
 272   template<typename T> struct A {
 273     struct B {
 274       enum class E : T;
 275       enum class E2 : T;
 276     };
 277   };
 278   template<typename T> enum class A<T>::B::E { e };
 279   template class A<int>;
 280
 281   struct B { enum class E; };
 282   template<typename T> enum class B::E { e }; // expected-error {{enumeration cannot be a template}}
 283 }
 284
 285 namespace PR16900 {
 286   enum class A;
 287   A f(A a) { return -a; } // expected-error {{invalid argument type 'A' to unary expression}}
 288 }
 289
 290 namespace PR18551 {
 291   enum class A { A };
 292   bool f() { return !A::A; } // expected-error {{invalid argument type 'PR18551::A' to unary expression}}
 293 }
 294
 295 namespace rdar15124329 {
 296   enum class B : bool { F, T };
 297
 298   const rdar15124329::B T1 = B::T;
 299   typedef B C;  const C T2 = B::T;
 300
 301   static_assert(T1 != B::F, "");
 302   static_assert(T2 == B::T, "");
 303 }
 304
 305 namespace PR18044 {
 306   enum class E { a };
 307
 308   int E::e = 0; // expected-error {{does not refer into a class}}
 309   void E::f() {} // expected-error {{does not refer into a class}}
 310   struct E::S {}; // expected-error {{no struct named 'S'}}
 311   struct T : E::S {}; // expected-error {{expected class name}}
 312   enum E::E {}; // expected-error {{no enum named 'E'}}
 313   int E::*p; // expected-error {{does not point into a class}}
 314   using E::f; // expected-error {{no member named 'f'}}
 315
 316   using E::a; // expected-warning {{using declaration naming a scoped enumerator is a C++20 extension}}
 317   E b = a;
 318 }
 319
 320 namespace test11 {
 321   enum class E { a };
 322   typedef E E2;
 323   E2 f1() { return E::a; }
 324
 325   bool f() { return !f1(); } // expected-error {{invalid argument type 'E2' (aka 'test11::E') to unary expression}}
 326 }
 327
 328 namespace PR35586 {
 329   enum C { R=-1, G, B };
 330   enum B { F = (enum C) -1, T}; // this should compile cleanly, it used to assert.
 331 };
 332
 333 namespace test12 {
 334 // Check that clang rejects this code without crashing in c++17.
 335 enum class A;
 336 enum class B;
 337 A a;
 338 B b{a}; // expected-error {{cannot initialize}}
 339 }