On 05.04.1998 Mike Walker wrote about PRIVATE / PROTECTED...
> Something that I am not quite clear on is the difference between
> private and protected specifiers within a class. Can someone explain
> the difference between these? Also when would each be used?
//I'll take a go at this one.  Please note that I just program as
//a hobby and anything I say is probably wrong, dangerous, illegal,
//and prohibited in Florida.
//
//public:  is seen by all classes
//
//protected: is seen by derived classes and members of the same class
//
//private:  is not seen by derived classes, it is only seen by members of the 
//          same class
// A base class
class foo
{
 public:
   void foofunction();
   int public_int;
	
 protected:
   int protected_int;
	
 private:
   int private_int;
};
void foo::foofunction()
{
   public_int = 1;    // legal
   protected_int = 1; // legal
   private_int = 1;   // legal
}
// A derived class
class bar : public foo
{
 public:
   void barfunction();
};
void bar::barfunction()
{
   public_int = 1;      // legal
   protected_int = 1;   // legal
   private_int = 1;     // ILLEGAL
   // noclass.cc:60: member 'private_int' is private
	
}
// A global function
int main(void)
{
   bar fly;
   fly.public_int = 1;      // legal
   fly.protected_int = 1;   // ILLEGAL
   // noclass.cc:71: member 'protected_int' is protected
   fly.private_int = 1;     // ILLEGAL
   // noclass.cc:73: member 'private_int' is private   
   return 0;
}
-- 
* jmr 0.7.17 [Linux] * benjamin.l.mcgee@purgatoire.org
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