I have a class that contains a nested class. The outer class is called
outer, and the nested class is called inner. When I try to compile the
following code, I get a number of errors. It is not obvious to me, where
I'm going wrong (the compiler messages do not seem to make much sense).

here is the code:

outer class declared as ff in "outer.h":

#include "inner.h"

class outer {
public:
    outer() ;
    ~outer() ;
private:
    class inner ;
    inner m_inner ;
public:
    void dothis(void){ m_inner.dothis() ; }
    void dothat(void){ m_inner.dothat() ; }
};

inner class declared as follows in "inner.h" :

#include "outer.h"

class outer::inner {
friend class outer ;

    outer::inner() ;
    ~outer::inner() ;

    void dothis( void ) {} ;
    void dothat( void ){} ;
}

Here is main() function:

#include "outer.h"
#include "inner.h"

int main(int argc, char* argv[]) {

    outer y ;
    y.dothis() ;
    y.dothat() ;

}

I will be very grateful for advice to help me fix this as I spent a
large portion of yesterday trying to fix this by reffering to various
documentation - none of ehich actually addresses the issue of using or
delegating to a nested class as I'm trying to do above. MTIA