The Private Member In Derived Class
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Because it accesses i via the method set : such method is protected hence accessible from Derived .
while we didn't allocate memory to i and didn't create an object of class Base
how it can be done?
Sergey Alexandrovich Kryukov
10-Jul-11 17:22pm
What do you mean allocate? -- it's not a pointer! Look, I see you completely lost in basics of programming. You need to step back and really understand variables, parameters, pointers, etc. before you go into OOP. This is what stops you, not classes.
--SA
You've just lost 1000 C++ points, with this comment. Please read a good book on C++ and OOP (if you create an object of class Derived , you get, for free, all the members, of class Base , because Derives is Base too. That's one of the reason inheritance is made for).
Sergey Alexandrovich Kryukov
10-Jul-11 17:21pm
Correct, a 5. OP is totally lost (see my answer).
--SA
This is not true: "private members doesn't Derive". This is not even false, just makes no sense. :-)
A member can not "derive", only a type can. All members are inherited, no exclusions.
—SA
Espen Harlinn
10-Jul-11 17:22pm
Sergey Alexandrovich Kryukov
10-Jul-11 17:29pm
so,how change method of Derived class works?
OriginalGriff
11-Jul-11 2:51am
Because the protected member function "Set" accesses the private member - which it is allowed to do, being a part of the "Base" class. The derived class cannot access private "Base" members except via Protected or public methods. Even then it has no direct access, it can only provide a parameter value which the protected function then uses as it will.
Christian Graus
10-Jul-11 17:24pm
Your protected code accesses your private member. It works as it should. What you want to do, is not clear, so 'works' is not defined.
Ouch, you just earned yourself a thorough whip-lashing with that suggestion!
;-p
Espen Harlinn
11-Jul-11 12:49pm
Possibly - I did mention something about the dirty tricks department :)
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I used to see everywhere that private members of base class are never inherited in derived class, no matter how you inherit the base class (private or protected or public).
But below question has really confused me up. I don't know why the output of this program is 80. It should be 1 byte (which is the size of an empty class in C++) because private members are never inherited.
This is mostly a problem of semantics and what different people refer to with inherited . When a type D inherits from a type B , each D object contains a full B object. From that point of view all of the members are there (and some people call this inherited ). On the other hand, those members are not accessible from the members of D , and from that point of view the members are as if they were not there (and some people call this not inherited ).
Private members of a base (no matter what accesibility) are not accessible from the derived types (assuming no friendship relationship), but they are there, an object of the derived type contains an object of the base type.
Yes, derived classes inherit members from all of their base classes.
The keywords private, public and protected affect only the accessibility of the items they are applied to. If something is not accessible in a particular context and you try to use it, the compiler will give you an error.
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https://www.codeproject.com/questions/223578/access-private-members-in-derived-class
https://stackoverflow.com/questions/26161346/are-private-members-of-base-class-always-inherited-in-derived-class-in-c
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The Private Member In Derived Class
