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How Base class members gets copied in inheritance when we copy/assign derived class objects?


How Base class members gets copied in inheritance when we copy/assign derived class objects?

By : Mathumitha Raja
Date : October 24 2020, 06:10 AM
Hope this helps I have following scenario: ,
How the members of base class will be copied
code :


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Does protected inheritance allow the derived class access the private members of its base class?

Does protected inheritance allow the derived class access the private members of its base class?


By : user1721223
Date : March 29 2020, 07:55 AM
wish of those help You are correct on point #1. Specifying private, protected or public when inheriting from a base class does not change anything access-wise on the derived class itself. Those access specifiers tell the compiler how to treat the base-class members when instances of the derived class are used elsewhere, or if the derived class happens to be used as a base class for other classes.
UPDATE: The following may help to illustrate the differences:
code :
class Base
{
    private:   int base_pri;
    protected: int base_pro;
    public:    int base_pub;
};
class With_Private_Base :   private Base   { void memberFn(); };
class With_Protected_Base : protected Base { void memberFn(); };
class With_Public_Base :    public Base    { void memberFn(); };

// this would be the same for all of the above 3 classes:
void With_PXXX_Base::memberFn()
{
    base_pri = 1; // error: `int Base::base_pri' is private
    base_pro = 1; // OK
    base_pub = 1; // OK
}
class A : public With_Private_Base { void memberFn(); }
void A::memberFn()
{
    base_pri = 1; // error: `int Base::base_pri' is private
    base_pro = 1; // error: `int Base::base_pro' is protected
    base_pub = 1; // error: `int Base::base_pub' is inaccessible
}

class B : public With_Protected_Base { void memberFn(); }
void B::memberFn()
{
    base_pri = 1; // error: `int Base::base_pri' is private
    base_pro = 1; // OK
    base_pub = 1; // OK
}

class C : public With_Public_Base { void memberFn(); }
void C::memberFn()
{
    base_pri = 1; // error: `int Base::base_pri' is private
    base_pro = 1; // OK
    base_pub = 1; // OK
}
void main()
{
    With_Private_Base   pri_base;
    pri_base.base_pri = 1; // error: `int Base::base_pri' is private
    pri_base.base_pro = 1; // error: `int Base::base_pro' is protected
    pri_base.base_pub = 1; // error: `int Base::base_pub' is inaccessible

    With_Protected_Base pro_base;
    pro_base.base_pri = 1; // error: `int Base::base_pri' is private
    pro_base.base_pro = 1; // error: `int Base::base_pro' is protected
    pro_base.base_pub = 1; // error: `int Base::base_pub' is inaccessible

    With_Public_Base    pub_base;
    pub_base.base_pri = 1; // error: `int Base::base_pri' is private
    pub_base.base_pro = 1; // error: `int Base::base_pro' is protected
    pub_base.base_pub = 1; // OK
}
How to copy private members of a base class in to a derived class's copy constructor

How to copy private members of a base class in to a derived class's copy constructor


By : user6396176
Date : March 29 2020, 07:55 AM
wish of those help You have below ways to accomplish this:
(1) Create a base copy constructor (not private) and invoke that in derived copy constructor.
code :
class Base {
  private: int i;
  public: Base(const Base& copy) : i(copy.i) {}
};

class Derived : public Base {
  Derived(const Derived& copy) : Base(copy) {}
};
Are base classes in inheritance copied to the derived class?

Are base classes in inheritance copied to the derived class?


By : Alejandro Gutierrez
Date : March 29 2020, 07:55 AM
may help you . Are base classes in inheritance copied to the derived class?
No, they aren't copied. They are intrinsically merged into the derived class.
How does friend class of the base class access members of that base class through objects of class derived from the base

How does friend class of the base class access members of that base class through objects of class derived from the base


By : Abdullah Essa
Date : March 29 2020, 07:55 AM
this will help Here is my codes in file source.cpp: , According to [class.access.base]/5:
Calling a base class function from a derived class object. Base class data members set in derived class constructor

Calling a base class function from a derived class object. Base class data members set in derived class constructor


By : michelepassante
Date : March 29 2020, 07:55 AM
it should still fix some issue I have looked for the solution to the problem below all over the internet. Some of the solutions given are exactly what I am doing, yet I am still getting an error when I try to compile my code. Any help would be greatly appreciated.
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