protected

C++ Specific —>

protected: [member-list]

protectedbase-class

When preceding a list of class members, the protected keyword specifies that those members are accessible only from member functions and friends of the class and its derived classes. This applies to all members declared up to the next access specifier or the end of the class.

When preceding the name of a base class, the protected keyword specifies that the public and protected members of the base class are protected members of the derived class.

Default access of members in a class is private. Default access of members in a structure or union is public.

Default access of a base class is private for classes and public for structures. Unions cannot have base classes.

For related information, see public, private, friend, and Table of Member Access Privileges.

END C++ Specific

Example

// Example of the protected keyword
class BaseClass
{
protected:
   int protectFunc();
};

class DerivedClass : public BaseClass
{
public:
   int useProtect()
      { protectFunc(); }    // protectFunc accessible
                           //    from derived class
};

void main()
{
BaseClass aBase;
DerivedClass aDerived;
   aBase.protectFunc();     // Error: protectFunc not
                            //    accessible
   aDerived.protectFunc();  // Error: protectFunc not
                            //    accessible in derived class
}