1// RUN: %clang_cc1 -std=c++11 -verify %s
2
3template<typename T> struct A {
4  enum E : T; // expected-note {{here}}
5  E v;
6  E f() { return A::e1; } // expected-error {{no member named 'e1' in 'A<T>'}}
7  E g() { return E::e1; }
8  E h();
9};
10
11A<int> a;
12A<int>::E a0 = A<int>().v;
13int n = A<int>::E::e1; // expected-error {{implicit instantiation of undefined member}}
14
15template<typename T> enum A<T>::E : T { e1, e2 }; // expected-note 2 {{declared here}}
16
17// FIXME: Now that A<T>::E is defined, we are supposed to inject its enumerators
18// into the already-instantiated class A<T>. This seems like a really bad idea,
19// though, so we don't implement that, but what we do implement is inconsistent.
20//
21// Either do as the standard says, or only include enumerators lexically defined
22// within the class in its scope.
23A<int>::E a1 = A<int>::e1; // expected-error {{no member named 'e1' in 'A<int>'; did you mean simply 'e1'?}}
24
25A<char>::E a2 = A<char>::e2;
26
27template<typename T> typename A<T>::E A<T>::h() { return e2; }
28A<short>::E a3 = A<short>().h();
29
30
31template<typename T> struct B {
32  enum class E;
33  E v;
34  E f() { return E::e1; }
35  E g();
36};
37
38B<int> b;
39B<int>::E b0 = B<int>().v;
40
41template<typename T> enum class B<T>::E { e1, e2 };
42B<int>::E b1 = B<int>::E::e1;
43
44B<char>::E b2 = B<char>::E::e2;
45
46template<typename T> typename B<T>::E B<T>::g() { return e2; }
47B<short>::E b3 = B<short>().g();
48
49
50// Enumeration members of class templates can be explicitly specialized. For
51// unscoped enumerations, specializations must be defined before the primary
52// template is, since otherwise the primary template will be implicitly
53// instantiated when we parse the nested name specifier.
54template<> enum A<long long>::E : long long { e3, e4 }; // expected-error {{explicit specialization of 'E' after instantiation}} expected-note {{first required here}}
55
56template<> enum class B<long long>::E { e3, e4 };
57B<long long>::E b4 = B<long long>::E::e4;
58
59B<long>::E b5;
60template<> enum class B<long>::E { e5 };
61void fb5() { b5 = decltype(b5)::e5; }
62B<long>::E b6 = B<long>::E::e5;
63
64
65template<typename T> struct C {
66  enum class E : T;
67};
68
69template<> enum class C<long long>::E : long long { e3, e4 };
70C<long long>::E c0 = C<long long>::E::e3;
71
72C<long>::E c1;
73template<> enum class C<long>::E : long { e5 };
74void fc1() { c1 = decltype(c1)::e5; }
75C<long>::E c2 = C<long>::E::e5;
76
77template<> enum class C<int>::E : int { e6 };
78template<typename T> enum class C<T>::E : T { e0 };
79C<int>::E c3 = C<int>::E::e6;
80C<int>::E c4 = C<int>::E::e0; // expected-error {{no member named 'e0' in 'C<int>::E'}}
81
82
83// Enumeration members can't be partially-specialized.
84template<typename T> enum class B<T*>::E { e5, e6 }; // expected-error {{nested name specifier for a declaration cannot depend on a template parameter}}
85
86
87// Explicit specializations can be forward-declared.
88template<typename T>
89struct D {
90  enum class E { e1 };
91};
92template<> enum class D<int>::E;
93D<int>::E d1 = D<int>::E::e1; // expected-error {{incomplete type 'D<int>::E'}}
94template<> enum class D<int>::E { e2 };
95D<int>::E d2 = D<int>::E::e2;
96D<char>::E d3 = D<char>::E::e1; // expected-note {{first required here}}
97D<char>::E d4 = D<char>::E::e2; // expected-error {{no member named 'e2' in 'D<char>::E'; did you mean simply 'e2'?}}
98template<> enum class D<char>::E { e3 }; // expected-error {{explicit specialization of 'E' after instantiation}}
99
100template<> enum class D<short>::E;
101struct F {
102  // Per C++11 [class.friend]p3, these friend declarations have no effect.
103  // Only classes and functions can be friends.
104  template<typename T> friend enum D<T>::E;
105  template<> friend enum D<short>::E;
106
107  template<> friend enum D<double>::E { e3 }; // expected-error {{cannot define a type in a friend declaration}}
108
109private:
110  static const int n = 1; // expected-note {{private here}}
111};
112template<> enum class D<short>::E {
113  e = F::n // expected-error {{private member}}
114};
115
116class Access {
117  friend class X;
118
119  template<typename T>
120  class Priv {
121    friend class X;
122
123    enum class E : T;
124  };
125
126  class S {
127    typedef int N; // expected-note {{here}}
128    static const int k = 3; // expected-note {{here}}
129
130    friend class Priv<char>;
131  };
132
133  static const int k = 5;
134};
135
136template<> enum class Access::Priv<Access::S::N>::E
137  : Access::S::N { // expected-error {{private member}}
138  a = Access::k, // ok
139  b = Access::S::k // expected-error {{private member}}
140};
141
142template<typename T> enum class Access::Priv<T>::E : T {
143  c = Access::k,
144  d = Access::S::k
145};
146
147class X {
148  Access::Priv<int>::E a = Access::Priv<int>::E::a;
149  Access::Priv<char>::E c = Access::Priv<char>::E::d;
150  // FIXME: We should see an access error for this enumerator.
151  Access::Priv<short>::E b = Access::Priv<short>::E::d;
152};
153