Whats wrong with this code? (nested classes)

[Alfonso Morra]

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

[Nishant Sivakumar]

Re: Whats wrong with this code? (nested classes)

Hmmm, inner.h includes outer.h and outer.h includes inner.h <-- a dumb
compiler would go into an infinite loop - a smart one would tell you that
you cannot do that.

--
Regards,
Nish [VC++ MVP]

http://www.voidnish.com

http://blog.voidnish.com

"Alfonso Morra" <sweet-science@the-ring.com> wrote in message
news:dbifbo$ils $1@nwrdmz03.dmz .ncs.ea.ibs-infra.bt.com...[color=blue]
>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
>
>[/color]

[Jeff Partch [MVP]]

Re: Whats wrong with this code? (nested classes)

"Alfonso Morra" <sweet-science@the-ring.com> wrote in message
news:dbifbo$ils $1@nwrdmz03.dmz .ncs.ea.ibs-infra.bt.com...[color=blue]
> 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[/color]

I think you can do it like this....

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

--
Jeff Partch [VC++ MVP]