Re: [Dev-C++] protected and private in c++ classes

[Daniel G. <sp...@ho...>]

As I understand it, when a class is derived PUBLICALLY from another class, 
it inherits the parent's public members as public.
So
class Person
{
public:
    String* HairColour;
}

class EmployeeID : public Person
{
    // We implicitly have a public member String* HairColour. If the code 
was written
    // instead of being hidden it would read
    // public:
    // String* HairColour;
}

If EmpoyeeID was derived as protected, we would have
// private:
// String* HairColour


By public to that class, I mean an object of the class can access the member 
by doing MyObj.PublicMember = 25;  or whatever.



>From: Siva Chandra <siv...@ya...>
>To: Daniel Glenfield <sp...@ho...>
>CC: Dev...@li...
>Subject: Re: [Dev-C++] protected and private in c++ classes
>Date: Tue, 9 Mar 2004 02:57:43 -0800 (PST)
>
>hi Daniel,
>
>I agree on your explaination for private but I am kind
>of confused with your explaination on protected. what
>do you mean by "//class employee now has private:
>..."?
>
>...and what do you mean by "...public to that class"?
>
>Siva Chandra
>
>--- Daniel Glenfield <sp...@ho...> wrote:
> > I don't think that is quite correct.
> >
> > Without getting too nerdy, private specifies that
> > the member variable or
> > method (methods are usually public, not private) can
> > only be accessed by a
> > method of that class, and cannot be accessed
> > directly.
> > So if I have a private member
> > int EmployeeID;
> > I cannot do
> >
> > MyObject.EmployeeID = 12345;
> > Because it is private. What I need is a public
> > method like this
> >
> > void SetEmployeeID(int Num)
> > {
> >     EmployeeID = Num;
> > }
> > Then I can do MyObject.SetEmployeeID(12345);
> >
> >
> > Protected means the members are public to that
> > class, but if a class is
> > derived from it then they become private. e.g.
> >
> > class Person
> > {
> > protected:
> > double DNASequence;
> > }
> >
> > class Employee : public Person
> > {
> >     // class Employee now has
> >     // private :
> >     // double DNASequence;
> >
> > }
> >
> > Let me know if any of this sounds wrong.
> >
> > Daniel
> >
> >
> > >From: Per Westermark <pw...@ia...>
> > >To: studioartoni <stu...@li...>
> > >CC: Dev...@li...
> > >Subject: Re: [Dev-C++] protected and private in c++
> > classes
> > >Date: Tue, 9 Mar 2004 11:15:18 +0100 (CET)
> > >
> > >Private is only for methods of the class.
> > >
> > >Protected are also available to all inherriting
> > classes.
> > >
> > >/Per W
> > >
> > >On Tue, 9 Mar 2004, studioartoni wrote:
> > >
> > > > Excuse the question,
> > > > but which is the difference between 'protected'
> > and 'private' in c++
> > >classes?
> > > > Thank you.
> > > >
> > > >
> > >
> > >
> > >
> >
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