C++ Private Structures

Yes structures can have private members, you just need to use the access specifier for the same.

struct Mystruct
{
    private:
       m_data;

};

Only difference between structure and class are:

• access specifier defaults to private for class and public for struct
• inheritance defaults to private for class and public for struct

How can you access them?
Just like you access private members of a class. i.e: they can only be accessed within the structures member functions and not in derived structure etc.