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| // 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'}}
// Case of template friend functions.
template<typename T> void func_31(T *x);
template<typename T1>
struct C31a {
template<typename T> friend void func_31(T *x) {}
};
template<typename T1>
struct C31b {
template<typename T> friend void func_31(T *x) {}
};
template<typename T> inline void func_32(T *x) {}
template<typename T1>
struct C32a {
template<typename T> friend void func_32(T *x) {}
};
template<typename T1>
struct C32b {
template<typename T> friend void func_32(T *x) {}
};
template<typename T1>
struct C33a {
template<typename T> friend void func_33(T *x) {}
};
template<typename T1>
struct C33b {
template<typename T> friend void func_33(T *x) {}
};
template<typename T> inline void func_34(T *x) {} // expected-note{{previous definition is here}}
template<typename T1>
struct C34 {
template<typename T> friend void func_34(T *x) {} // expected-error{{redefinition of 'func_34'}}
};
C34<int> v34; // expected-note{{in instantiation of template class 'C34<int>' requested here}}
template<typename T> inline void func_35(T *x);
template<typename T1>
struct C35a {
template<typename T> friend void func_35(T *x) {} // expected-note{{previous definition is here}}
};
template<typename T1>
struct C35b {
template<typename T> friend void func_35(T *x) {} // expected-error{{redefinition of 'func_35'}}
};
C35a<int> v35a;
C35b<int> v35b; // expected-note{{in instantiation of template class 'C35b<int>' requested here}}
template<typename T> void func_36(T *x);
template<typename T1>
struct C36 {
template<typename T> friend void func_36(T *x) {} // expected-error{{redefinition of 'func_36'}}
// expected-note@-1{{previous definition is here}}
};
C36<int> v36a;
C36<long> v36b; //expected-note{{in instantiation of template class 'C36<long>' requested here}}
template<typename T> void func_37(T *x);
template<typename T1>
struct C37 {
template<typename T> friend void func_37(T *x) {} // expected-note{{previous definition is here}}
};
C37<int> v37;
template<typename T> void func_37(T *x) {} // expected-error{{redefinition of 'func_37'}}
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();
}
}
namespace PR39742 {
template<typename>
struct wrapper {
template<typename>
friend void friend_function_template() {} // expected-error{{redefinition of 'friend_function_template'}}
// expected-note@-1{{previous definition is here}}
};
wrapper<bool> x;
wrapper<int> y; // expected-note{{in instantiation of template class 'PR39742::wrapper<int>' requested here}}
}
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