p3.cpp revision 8a407370c37229f2b69fe643850959b98899c28a 
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