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class A { friend void fun(A a); friend void fun2(); friend void fun3(); }; void fun(A a) { std::cout << "I'm here" << std::endl; } void fun2() { std::cout << "I'm here2" << std::endl; } void fun3(); int main() { fun(A()); // works ok //fun2(); error: 'fun2' was not declared in this scope //A::fun2(); error: 'fun2' is not a member of 'A' fun3(); // works ok }
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