clang/test/SemaCXX/enum-scoped.cpp

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