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 9 namespace N { 10 struct S0 { 11 friend struct F0; 12 friend void f0(int); 13 struct F0 member_func(); 14 }; 15 struct F0 { }; f0()16 F0 f0() { return S0().member_func(); } 17 } 18 N::F0 f0_var = N::f0(); 19 20 // Ensure we can handle attaching friend declarations to an enclosing namespace 21 // with multiple contexts. 22 namespace N { struct S1 { struct IS1; }; } 23 namespace N { 24 struct S1::IS1 { 25 friend struct F1; 26 friend void f1(int); 27 struct F1 member_func(); 28 }; 29 struct F1 { }; f1()30 F1 f1() { return S1::IS1().member_func(); } 31 } 32 N::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 45 template<typename T> struct X0 { }; 46 struct X1 { }; 47 48 struct Y { 49 template<typename T> union X0; 50 template<typename T> friend union X0; 51 52 union X1; 53 friend union X1; 54 }; 55 56 namespace N { 57 namespace M { 58 template<typename T> class X; 59 } 60 } 61 62 namespace 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 namespace test5 { 73 template <class T> void f(T); 74 namespace ns { 75 class A { 76 friend void f<int>(int); 77 static void foo(); // expected-note 2 {{declared private here}} 78 }; 79 80 // Note that this happens without instantiation. f(T)81 template <class T> void f(T) { 82 A::foo(); // expected-error {{'foo' is a private member of 'test5::ns::A'}} 83 } 84 } 85 f(T)86 template <class T> void f(T) { 87 ns::A::foo(); // expected-error {{'foo' is a private member of 'test5::ns::A'}} 88 } 89 90 template void f<int>(int); 91 template void f<long>(long); //expected-note {{instantiation}} 92 } 93 94 namespace test6 { 95 class A; 96 namespace ns { 97 class B { 98 static void foo(); // expected-note {{implicitly declared private here}} 99 friend union A; 100 }; 101 102 union A { test()103 void test() { 104 B::foo(); 105 } 106 }; 107 } 108 109 class A { test()110 void test() { 111 ns::B::foo(); // expected-error {{'foo' is a private member of 'test6::ns::B'}} 112 } 113 }; 114 } 115 116 // We seem to be following a correct interpretation with these, but 117 // the standard could probably be a bit clearer. 118 namespace test7a { 119 namespace ns { 120 class A; 121 } 122 123 using namespace ns; 124 class B { 125 static void foo(); 126 friend class A; 127 }; 128 129 class ns::A { test()130 void test() { 131 B::foo(); 132 } 133 }; 134 } 135 namespace test7b { 136 namespace ns { 137 class A; 138 } 139 140 using ns::A; 141 class B { 142 static void foo(); 143 friend class A; 144 }; 145 146 class ns::A { test()147 void test() { 148 B::foo(); 149 } 150 }; 151 } 152 namespace test7c { 153 namespace ns1 { 154 class A; 155 } 156 157 namespace ns2 { 158 // ns1::A appears as if declared in test7c according to [namespace.udir]p2. 159 // I think that means we aren't supposed to find it. 160 using namespace ns1; 161 class B { 162 static void foo(); // expected-note {{implicitly declared private here}} 163 friend class A; 164 }; 165 } 166 167 class ns1::A { test()168 void test() { 169 ns2::B::foo(); // expected-error {{'foo' is a private member of 'test7c::ns2::B'}} 170 } 171 }; 172 } 173 namespace test7d { 174 namespace ns1 { 175 class A; 176 } 177 178 namespace ns2 { 179 // Honor the lexical context of a using-declaration, though. 180 using ns1::A; 181 class B { 182 static void foo(); 183 friend class A; 184 }; 185 } 186 187 class ns1::A { test()188 void test() { 189 ns2::B::foo(); 190 } 191 }; 192 } 193