llvm-project/clang/test/SemaCXX/enum-scoped.cpp

// RUN: %clang_cc1 -fsyntax-only -pedantic -std=c++11 -verify -triple x86_64-apple-darwin %s

enum class E1 {
  Val1 = 1L
};

enum struct E2 {
  Val1 = '\0'
};

E1 v1 = Val1; // expected-error{{undeclared identifier}}
E1 v2 = E1::Val1;

static_assert(sizeof(E1) == sizeof(int), "bad size");
static_assert(sizeof(E1::Val1) == sizeof(int), "bad size");
static_assert(sizeof(E2) == sizeof(int), "bad size");
static_assert(sizeof(E2::Val1) == sizeof(int), "bad size");

E1 v3 = E2::Val1; // expected-error{{cannot initialize a variable}}
int x1 = E1::Val1; // expected-error{{cannot initialize a variable}}

enum E3 : char {
  Val2 = 1
};

E3 v4 = Val2;
E1 v5 = Val2; // expected-error{{cannot initialize a variable}}

static_assert(sizeof(E3) == 1, "bad size");

int x2 = Val2;

int a1[Val2];
int a2[E1::Val1]; // expected-error{{size of array has non-integer type}}

int* p1 = new int[Val2];
int* p2 = new int[E1::Val1]; // expected-error{{array size expression must have integral or unscoped enumeration type, not 'E1'}}

enum class E4 {
  e1 = -2147483648, // ok
  e2 = 2147483647, // ok
  e3 = 2147483648 // expected-error{{enumerator value evaluates to 2147483648, which cannot be narrowed to type 'int'}}
};

enum class E5 {
  e1 = 2147483647, // ok
  e2 // expected-error{{2147483648 is not representable in the underlying}}
};

enum class E6 : bool {
    e1 = false, e2 = true,
    e3 // expected-error{{2 is not representable in the underlying}}
};

enum E7 : bool {
    e1 = false, e2 = true,
    e3 // expected-error{{2 is not representable in the underlying}}
};

template <class T>
struct X {
  enum E : T {
    e1, e2,
    e3 // expected-error{{2 is not representable in the underlying}}
  };
};

X<bool> X2; // expected-note{{in instantiation of template}}

enum Incomplete1; // expected-error{{C++ forbids forward references}}

enum Complete1 : int;
Complete1 complete1;

enum class Complete2;
Complete2 complete2;

// All the redeclarations below are done twice on purpose. Tests that the type
// of the declaration isn't changed.

enum class Redeclare2; // expected-note{{previous use is here}} expected-note{{previous use is here}}
enum Redeclare2; // expected-error{{previously declared as scoped}}
enum Redeclare2; // expected-error{{previously declared as scoped}}

enum Redeclare3 : int; // expected-note{{previous use is here}} expected-note{{previous use is here}}
enum Redeclare3; // expected-error{{previously declared with fixed underlying type}}
enum Redeclare3; // expected-error{{previously declared with fixed underlying type}}

enum class Redeclare5;
enum class Redeclare5 : int; // ok

enum Redeclare6 : int; // expected-note{{previous use is here}} expected-note{{previous use is here}}
enum Redeclare6 : short; // expected-error{{redeclared with different underlying type}}
enum Redeclare6 : short; // expected-error{{redeclared with different underlying type}}

enum class Redeclare7; // expected-note{{previous use is here}} expected-note{{previous use is here}}
enum class Redeclare7 : short; // expected-error{{redeclared with different underlying type}}
enum class Redeclare7 : short; // expected-error{{redeclared with different underlying type}}

enum : long {
  long_enum_val = 10000
};

enum : long x; // expected-error{{unnamed enumeration must be a definition}} \
// expected-warning{{declaration does not declare anything}}

void PR9333() {
  enum class scoped_enum { yes, no, maybe };
  scoped_enum e = scoped_enum::yes;
  if (e == scoped_enum::no) { }
}

// <rdar://problem/9366066>
namespace rdar9366066 {
  enum class X : unsigned { value };

  void f(X x) {
    x % X::value; // expected-error{{invalid operands to binary expression ('rdar9366066::X' and 'rdar9366066::X')}}
    x % 8; // expected-error{{invalid operands to binary expression ('rdar9366066::X' and 'int')}}
  }
}

// Part 1 of PR10264
namespace test5 {
  namespace ns {
    typedef unsigned Atype;
    enum A : Atype;
  }
  enum ns::A : ns::Atype {
    x, y, z
  };
}

// Part 2 of PR10264
namespace test6 {
  enum A : unsigned;
  struct A::a; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
  enum A::b; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
  int A::c; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
  void A::d(); // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
  void test() {
    (void) A::e; // expected-error {{incomplete type 'test6::A' named in nested name specifier}}
  }
}

namespace PR11484 {
  const int val = 104;
  enum class test1 { owner_dead = val, };
}

namespace N2764 {
  enum class E { a, b };
  enum E x1 = E::a; // ok
  enum class E x2 = E::a; // expected-error {{reference to scoped enumeration must use 'enum' not 'enum class'}}

  enum F { a, b };
  enum F y1 = a; // ok
  enum class F y2 = a; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}

  struct S {
    friend enum class E; // expected-error {{reference to scoped enumeration must use 'enum' not 'enum class'}}
    friend enum class F; // expected-error {{reference to enumeration must use 'enum' not 'enum class'}}

    friend enum G {}; // expected-error {{forward reference}} expected-error {{cannot define a type in a friend declaration}}
    friend enum class H {}; // expected-error {{cannot define a type in a friend declaration}}

    enum A : int;
    A a;
  } s;

  enum S::A : int {};

  enum class B;
}

enum class N2764::B {};

namespace PR12106 {
  template<typename E> struct Enum {
    Enum() : m_e(E::Last) {}
    E m_e;
  };

  enum eCOLORS { Last };
  Enum<eCOLORS> e;
}

namespace test7 {
  enum class E { e = (struct S*)0 == (struct S*)0 };
  S *p;
}