class A{ void foo(); }
class B{void foo1(); }
class C {void foo1(); }

Design like below:
B.foo1() can access A.foo(), but C.foo1() can not access A.foo()

Question

class A{ void foo(); }
class B{void foo1(); }
class C {void foo1(); }

Design like below:
B.foo1() can access A.foo(), but C.foo1() can not access A.foo()

Anonimo · Accepted Answer

class A{ protected: void foo();}
class B : class A{ foo1();}

Xiaoge Su · Answer

class A { private: void foo(); friend class B;};
class B { void foo1(); }
class C { void foo1{};

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