llvm-project/clang/test/SemaCXX/friend.cpp

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// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++14
friend class A; // expected-error {{'friend' used outside of class}}
void f() { friend class A; } // expected-error {{'friend' used outside of class}}
class C { friend class A; };
class D { void f() { friend class A; } }; // expected-error {{'friend' used outside of class}}
// PR5760
namespace test0 {
namespace ns {
void f(int);
}
struct A {
friend void ns::f(int a);
};
}
// Test derived from LLVM's Registry.h
namespace test1 {
template <class T> struct Outer {
void foo(T);
struct Inner {
friend void Outer::foo(T);
};
};
void test() {
(void) Outer<int>::Inner();
}
}
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// PR5476
namespace test2 {
namespace foo {
void Func(int x);
}
class Bar {
friend void ::test2::foo::Func(int x);
};
}
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// PR5134
namespace test3 {
class Foo {
friend const int getInt(int inInt = 0) {}
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};
}
namespace test4 {
class T4A {
friend class T4B;
public:
T4A(class T4B *);
protected:
T4B *mB; // error here
};
class T4B {};
}
namespace rdar8529993 {
struct A { ~A(); };
struct B : A
{
template<int> friend A::~A(); // expected-error {{destructor cannot be declared as a template}}
};
}
// PR7915
namespace test5 {
struct A;
struct A1 { friend void A(); };
struct B { friend void B(); };
}
// PR8479
namespace test6_1 {
class A {
public:
private:
friend class vectorA;
A() {}
};
class vectorA {
public:
vectorA(int i, const A& t = A()) {}
};
void f() {
vectorA v(1);
}
}
namespace test6_2 {
template<class T>
class vector {
public:
vector(int i, const T& t = T()) {}
};
class A {
public:
private:
friend class vector<A>;
A() {}
};
void f() {
vector<A> v(1);
}
}
namespace test6_3 {
template<class T>
class vector {
public:
vector(int i) {}
void f(const T& t = T()) {}
};
class A {
public:
private:
friend void vector<A>::f(const A&);
A() {}
};
void f() {
vector<A> v(1);
v.f();
}
}
namespace test7 {
extern "C" {
class X {
friend int test7_f() { return 42; }
};
}
}
// PR15485
namespace test8 {
namespace ns1 {
namespace ns2 {
template<class T> void f(T t); // expected-note {{target of using declaration}}
}
using ns2::f; // expected-note {{using declaration}}
}
struct A { void f(); }; // expected-note 2{{target of using declaration}}
struct B : public A { using A::f; }; // expected-note {{using declaration}}
template<typename T> struct C : A { using A::f; }; // expected-note {{using declaration}}
struct X {
template<class T> friend void ns1::f(T t); // expected-error {{cannot befriend target of using declaration}}
friend void B::f(); // expected-error {{cannot befriend target of using declaration}}
friend void C<int>::f(); // expected-error {{cannot befriend target of using declaration}}
};
}
// PR16423
namespace test9 {
class C {
};
struct A {
friend void C::f(int, int, int) {} // expected-error {{no function named 'f' with type 'void (int, int, int)' was found in the specified scope}}
};
}
namespace test10 {
struct X {};
extern void f10_a();
extern void f10_a(X);
struct A {
friend void f10_a();
friend void f10_b();
friend void f10_c();
friend void f10_d();
friend void f10_a(X);
friend void f10_b(X);
friend void f10_c(X);
friend void f10_d(X);
};
extern void f10_b();
extern void f10_b(X);
struct B {
friend void f10_a();
friend void f10_b();
friend void f10_c();
friend void f10_d();
friend void f10_a(X);
friend void f10_b(X);
friend void f10_c(X);
friend void f10_d(X);
};
extern void f10_c();
extern void f10_c(X);
// FIXME: Give a better diagnostic for the case where a function exists but is
// not visible.
void g(X x) {
f10_a();
f10_b();
f10_c();
f10_d(); // expected-error {{undeclared identifier}}
::test10::f10_a();
::test10::f10_b();
::test10::f10_c();
::test10::f10_d(); // expected-error {{no member named 'f10_d'}}
f10_a(x);
f10_b(x);
f10_c(x);
f10_d(x); // PR16597: expected-error {{undeclared identifier}}
::test10::f10_a(x);
::test10::f10_b(x);
::test10::f10_c(x);
::test10::f10_d(x); // expected-error {{no type named 'f10_d'}}
}
struct Y : X {
friend void f10_d();
friend void f10_d(X);
};
struct Z {
operator X();
friend void f10_d();
friend void f10_d(X);
};
void g(X x, Y y, Z z) {
f10_d(); // expected-error {{undeclared identifier}}
::test10::f10_d(); // expected-error {{no member named 'f10_d'}}
// f10_d is visible to ADL in the second and third cases.
f10_d(x); // expected-error {{undeclared identifier}}
f10_d(y);
f10_d(z);
// No ADL here.
::test10::f10_d(x); // expected-error {{no type named 'f10_d'}}
::test10::f10_d(y); // expected-error {{no type named 'f10_d'}}
::test10::f10_d(z); // expected-error {{no type named 'f10_d'}}
}
void local_externs(X x, Y y) {
extern void f10_d();
extern void f10_d(X);
f10_d();
f10_d(x);
// FIXME: This lookup should fail, because the local extern declaration
// should suppress ADL.
f10_d(y);
{
int f10_d;
f10_d(); // expected-error {{not a function}}
f10_d(x); // expected-error {{not a function}}
f10_d(y); // expected-error {{not a function}}
}
}
void i(X x, Y y) {
f10_d(); // expected-error {{undeclared identifier}}
f10_d(x); // expected-error {{undeclared identifier}}
f10_d(y);
}
struct C {
friend void f10_d();
friend void f10_d(X);
};
void j(X x, Y y) {
f10_d(); // expected-error {{undeclared identifier}}
f10_d(x); // expected-error {{undeclared identifier}}
f10_d(y);
}
extern void f10_d();
extern void f10_d(X);
void k(X x, Y y, Z z) {
// All OK now.
f10_d();
f10_d(x);
::test10::f10_d();
::test10::f10_d(x);
::test10::f10_d(y);
::test10::f10_d(z);
}
}
namespace test11 {
class __attribute__((visibility("hidden"))) B;
class A {
friend class __attribute__((visibility("hidden"), noreturn)) B; // expected-warning {{'noreturn' attribute only applies to functions and methods}}
};
}
namespace pr21851 {
// PR21851 was a problem where we assumed that when the friend function redecl
// lookup found a C++ method, it would necessarily have a qualifier. Below we
// have some test cases where unqualified lookup finds C++ methods without using
// qualifiers. Unfortunately, we can't exercise the case of an access check
// failure because nested classes always have access to the members of outer
// classes.
void friend_own_method() {
class A {
void m() {}
friend void m();
};
}
void friend_enclosing_method() {
class A;
class C {
int p;
friend class A;
};
class A {
void enclosing_friend() {
(void)b->p;
(void)c->p;
}
class B {
void b(A *a) {
(void)a->c->p;
}
int p;
friend void enclosing_friend();
};
B *b;
C *c;
};
}
static auto friend_file_func() {
extern void file_scope_friend();
class A {
int p;
friend void file_scope_friend();
};
return A();
}
void file_scope_friend() {
auto a = friend_file_func();
(void)a.p;
}
}
template<typename T>
struct X_pr6954 {
operator int();
friend void f_pr6954(int x);
};
int array0_pr6954[sizeof(X_pr6954<int>)];
int array1_pr6954[sizeof(X_pr6954<float>)];
void g_pr6954() {
f_pr6954(5); // expected-error{{undeclared identifier 'f_pr6954'}}
}
namespace tag_redecl {
namespace N {
struct X *p;
namespace {
class K {
friend struct X;
};
}
}
namespace N {
struct X;
X *q = p;
}
}
namespace default_arg {
void f();
void f(void*); // expected-note {{previous}}
struct X {
friend void f(int a, int b = 0) {}
friend void f(void *p = 0) {} // expected-error {{must be the only}}
};
}