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Error C2248: cannot access private struct declared in class

4eyesgirl
4eyesgirl asked
on
Medium Priority
571 Views
Last Modified: 2008-01-16
Hi expert,

I don't understand why the following code is not able to compile on Windows, I was able to compile it on redhat 3.0.

ClassFreeMem<ClassOne::ClassTwo>*
      ClassOne::ClassTwo::freememory= 0;
ClassFreeMem<ClassOne>* coneClass::freememory= 0;
struct InitFreeMemPtrs
{
   InitFreeMemPtrs(void)       // Default constructor.
   {
      // Allocate the freestore in the correct order.
      ClassOne::ClassTwo::freememory= new ClassFreeMem<ClassOne::ClassTwo>;  -> compile error here C2248
      ClassOne::freememory= new ClassFreeMem<ClassOne>;
   }

   ~InitFreeMemPtrs(void)      // Default destructor.
   {
      // Delete the freestore in the correct order.
      delete ClassOne::freememory;
      delete ClassOne::ClassTwo::freememory;  -> compile error here C2248
   }
};

InitFreeMemPtrs InitFreeMem;


ClassOne
{
public:
 static FlFreeStoreClass<ClassOne>* freememory;
private:
struct ClassTwo
{
static ClassFreeMem<ClassTwo>* freememory;
}
}


If I move the struct ClassTwo in the public area, then I am able to compile.  At this point, I would like to find a better solution than moving the struct ClassTwo to public.  Why this is able to compile on Linux, but not windows?

Looking foward to hear from you.
Comment
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CERTIFIED EXPERT
Top Expert 2012
Commented:
I am not sure why that compiles on Linux (it shouldn't), but making 'InitFreeMemPtrs' a 'friend' of 'ClassOne' should work, i.e.

ClassOne
{
friend struct InitFreeMemPtrs;
public:
 static FlFreeStoreClass<ClassOne>* freememory;
private:
struct ClassTwo
{
static ClassFreeMem<ClassTwo>* freememory;
}
}


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Author

Commented:
Jkr -

Do you know the compile did let this line of code compile?  
ClassFreeMem<ClassOne::ClassTwo>*
      ClassOne::ClassTwo::freememory= 0;
What is the difference between this one than the one in the constructor?


jkr
CERTIFIED EXPERT
Top Expert 2012

Commented:
Shouldn't compile either, but may (erroneously) look like a static member initializer to the compiler. Weird.

Author

Commented:
Thanks jkr.

As alwasy - you are a great help!!!
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