1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 | // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11 // If a friend function is defined in several non-template classes, // it is an error. void func1(int); struct C1a { friend void func1(int) {} // expected-note{{previous definition is here}} }; struct C1b { friend void func1(int) {} // expected-error{{redefinition of 'func1'}} }; // If a friend function is defined in both non-template and template // classes it is an error only if the template is instantiated. void func2(int); struct C2a { friend void func2(int) {} }; template<typename T> struct C2b { friend void func2(int) {} }; void func3(int); struct C3a { friend void func3(int) {} // expected-note{{previous definition is here}} }; template<typename T> struct C3b { friend void func3(int) {} // expected-error{{redefinition of 'func3'}} }; C3b<long> c3; // expected-note{{in instantiation of template class 'C3b<long>' requested here}} // If a friend function is defined in several template classes it is an error // only if several templates are instantiated. void func4(int); template<typename T> struct C4a { friend void func4(int) {} }; template<typename T> struct C4b { friend void func4(int) {} }; void func5(int); template<typename T> struct C5a { friend void func5(int) {} }; template<typename T> struct C5b { friend void func5(int) {} }; C5a<long> c5a; void func6(int); template<typename T> struct C6a { friend void func6(int) {} // expected-note{{previous definition is here}} }; template<typename T> struct C6b { friend void func6(int) {} // expected-error{{redefinition of 'func6'}} }; C6a<long> c6a; C6b<int*> c6b; // expected-note{{in instantiation of template class 'C6b<int *>' requested here}} void func7(int); template<typename T> struct C7 { friend void func7(int) {} // expected-error{{redefinition of 'func7'}} // expected-note@-1{{previous definition is here}} }; C7<long> c7a; C7<int*> c7b; // expected-note{{in instantiation of template class 'C7<int *>' requested here}} // Even if clases are not instantiated and hence friend functions defined in them are not // available, their declarations can be checked. void func8(int); // expected-note{{previous declaration is here}} template<typename T> struct C8a { friend long func8(int); // expected-error{{functions that differ only in their return type cannot be overloaded}} }; void func9(int); // expected-note{{previous declaration is here}} template<typename T> struct C9a { friend int func9(int); // expected-error{{functions that differ only in their return type cannot be overloaded}} }; void func10(int); // expected-note{{previous declaration is here}} template<typename T> struct C10a { friend int func10(int); // expected-error{{functions that differ only in their return type cannot be overloaded}} }; void func_11(); // expected-note{{previous declaration is here}} template<typename T> class C11 { friend int func_11(); // expected-error{{functions that differ only in their return type cannot be overloaded}} }; void func_12(int x); // expected-note{{previous declaration is here}} template<typename T> class C12 { friend void func_12(int x = 0); // expected-error{{friend declaration specifying a default argument must be the only declaration}} }; // Friend function with uninstantiated body is still a definition. template<typename T> struct C20 { friend void func_20() {} // expected-note{{previous definition is here}} }; C20<int> c20i; void func_20() {} // expected-error{{redefinition of 'func_20'}} template<typename T> struct C21a { friend void func_21() {} // expected-note{{previous definition is here}} }; template<typename T> struct C21b { friend void func_21() {} // expected-error{{redefinition of 'func_21'}} }; C21a<int> c21ai; C21b<int> c21bi; // expected-note{{in instantiation of template class 'C21b<int>' requested here}} template<typename T> struct C22a { friend void func_22() {} // expected-note{{previous definition is here}} }; template<typename T> struct C22b { friend void func_22(); }; C22a<int> c22ai; C22b<int> c22bi; void func_22() {} // expected-error{{redefinition of 'func_22'}} namespace pr22307 { struct t { friend int leak(t); }; template<typename v> struct m { friend int leak(t) { return sizeof(v); } // expected-error{{redefinition of 'leak'}} expected-note{{previous definition is here}} }; template struct m<char>; template struct m<short>; // expected-note{{in instantiation of template class 'pr22307::m<short>' requested here}} int main() { leak(t()); } } namespace pr17923 { void f(unsigned long long); template<typename T> struct X { friend void f(unsigned long long) { T t; } }; int main() { f(1234); } } namespace pr17923a { int get(); template< int value > class set { friend int get() { return value; } // return 0; is OK }; template class set< 5 >; int main() { get(); } } namespace pr8035 { void Function(); int main(int argc, char* argv[]) { Function(); } template <typename T> struct Test { friend void Function() { } }; template class Test<int>; } namespace pr14785 { template<typename T> struct Somewhat { void internal() const { } friend void operator+(int const &, Somewhat<T> const &) {} // expected-error{{redefinition of 'operator+'}} }; void operator+(int const &, Somewhat<char> const &x) { // expected-note {{previous definition is here}} x.internal(); // expected-note{{in instantiation of template class 'pr14785::Somewhat<char>' requested here}} } } namespace D30375 { template <typename K> struct B { template <typename A> bool insert(A &); }; template <typename K> template <typename A> bool B<K>::insert(A &x) { return x < x; } template <typename K> class D { B<K> t; public: K x; bool insert() { return t.insert(x); } template <typename K1> friend bool operator<(const D<K1> &, const D<K1> &); }; template <typename K> bool operator<(const D<K> &, const D<K> &); void func() { D<D<int>> cache; cache.insert(); } } |