1// RUN: %clang_cc1 -fsyntax-only %s -verify
2
3// C++'0x [namespace.memdef] p3:
4//   Every name first declared in a namespace is a member of that namespace. If
5//   a friend declaration in a non-local class first declares a class or
6//   function the friend class or function is a member of the innermost
7//   enclosing namespace.
8
9namespace N {
10  struct S0 {
11    friend struct F0;
12    friend void f0(int);
13    struct F0 member_func();
14  };
15  struct F0 { };
16  F0 f0() { return S0().member_func(); }
17}
18N::F0 f0_var = N::f0();
19
20// Ensure we can handle attaching friend declarations to an enclosing namespace
21// with multiple contexts.
22namespace N { struct S1 { struct IS1; }; }
23namespace N {
24  struct S1::IS1 {
25    friend struct F1;
26    friend void f1(int);
27    struct F1 member_func();
28  };
29  struct F1 { };
30  F1 f1() { return S1::IS1().member_func(); }
31}
32N::F1 f1_var = N::f1();
33
34//   The name of the friend is not found by unqualified lookup (3.4.1) or by
35//   qualified lookup (3.4.3) until a matching declaration is provided in that
36//   namespace scope (either before or after the class definition granting
37//   friendship). If a friend function is called, its name may be found by the
38//   name lookup that considers functions from namespaces and classes
39//   associated with the types of the function arguments (3.4.2). If the name
40//   in a friend declaration is neither qualified nor a template-id and the
41//   declaration is a function or an elaborated-type-specifier, the lookup to
42//   determine whether the entity has been previously declared shall not
43//   consider any scopes outside the innermost enclosing namespace.
44
45template<typename T> struct X0 { };
46struct X1 { };
47
48struct Y {
49  template<typename T> union X0;
50  template<typename T> friend union X0;
51
52  union X1;
53  friend union X1;
54};
55
56namespace N {
57  namespace M {
58    template<typename T> class X;
59  }
60}
61
62namespace N3 {
63  class Y {
64    template<typename T> friend class N::M::X;
65  };
66}
67
68// FIXME: Woefully inadequate for testing
69
70// Friends declared as template-ids aren't subject to the restriction
71// on innermost namespaces.
72// rdar://problem/8552377
73namespace test5 {
74  template <class T> void f(T);
75  namespace ns {
76    class A {
77      friend void f<int>(int);
78      static void foo(); // expected-note 2 {{declared private here}}
79    };
80
81    // Note that this happens without instantiation.
82    template <class T> void f(T) {
83      A::foo(); // expected-error {{'foo' is a private member of 'test5::ns::A'}}
84    }
85  }
86
87  template <class T> void f(T) {
88    ns::A::foo(); // expected-error {{'foo' is a private member of 'test5::ns::A'}}
89  }
90
91  template void f<int>(int);
92  template void f<long>(long); //expected-note {{instantiation}}
93}
94
95// rdar://13393749
96namespace test6 {
97  class A;
98  namespace ns {
99    class B {
100      static void foo(); // expected-note {{implicitly declared private here}}
101      friend union A;
102    };
103
104    union A {
105      void test() {
106        B::foo();
107      }
108    };
109  }
110
111  class A {
112    void test() {
113      ns::B::foo(); // expected-error {{'foo' is a private member of 'test6::ns::B'}}
114    }
115  };
116}
117
118// We seem to be following a correct interpretation with these, but
119// the standard could probably be a bit clearer.
120namespace test7a {
121  namespace ns {
122    class A;
123  }
124
125  using namespace ns;
126  class B {
127    static void foo();
128    friend class A;
129  };
130
131  class ns::A {
132    void test() {
133      B::foo();
134    }
135  };
136}
137namespace test7b {
138  namespace ns {
139    class A;
140  }
141
142  using ns::A;
143  class B {
144    static void foo();
145    friend class A;
146  };
147
148  class ns::A {
149    void test() {
150      B::foo();
151    }
152  };
153}
154namespace test7c {
155  namespace ns1 {
156    class A;
157  }
158
159  namespace ns2 {
160    // ns1::A appears as if declared in test7c according to [namespace.udir]p2.
161    // I think that means we aren't supposed to find it.
162    using namespace ns1;
163    class B {
164      static void foo(); // expected-note {{implicitly declared private here}}
165      friend class A;
166    };
167  }
168
169  class ns1::A {
170    void test() {
171      ns2::B::foo(); // expected-error {{'foo' is a private member of 'test7c::ns2::B'}}
172    }
173  };
174}
175namespace test7d {
176  namespace ns1 {
177    class A;
178  }
179
180  namespace ns2 {
181    // Honor the lexical context of a using-declaration, though.
182    using ns1::A;
183    class B {
184      static void foo();
185      friend class A;
186    };
187  }
188
189  class ns1::A {
190    void test() {
191      ns2::B::foo();
192    }
193  };
194}
195