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