Greetings, I currently have some code in which almost every class needs to privately inherit a global parent class, and I've hit a problem when class A inherits the global parent, class B likewise inherits that global parent, and class B inherits class A; perhaps code will make more sense...

g++ Wrote:warning: direct base `GlobalParent' inaccessible in `Child' due to ambiguity

I thought that this wouldn't pose a problem, as the GlobalParent inherited by Parent should be hidden from/inaccessible to Child; except that I've obviously misunderstood the scope rules in C++, and Child is seeing both the GlobalParent it inherits, and the GlobalParent inherited by Parent, which should be hidden/private...

Any suggestions as to how to fix this?

You need to use virtual inheritance, eg "class Child : public virtual Parent"

But, looking at your example code, it seems like you'd be better of rethinking the class hierarchy.

DoG Wrote:You need to use virtual inheritance

Thanks for the suggestion DoG! I need a better book on C++ That does still seem like a bug in the inheritance scope rules though, given that the inheritance was private

DoG Wrote:But [...] it seems like you'd be better of rethinking the class hierarchy

Unfortunately, that isn't possible

sealfin Wrote:Thanks for the suggestion DoG! I need a better book on C++ That does still seem like a bug in the inheritance scope rules though, given that the inheritance was private

Unfortunately, that isn't possible

[noparse]When you inherit from a class as private, that doesn't mean its inaccessible. It just affects the scopes of the parent class in the inherited class, eg Parent::public becomes a part of Child::private.[/noparse]

Also, why is it not possible to refactor this? Your inheritance scheme seems pretty nonsensical.

I've never used anything other than public inheritance... chances are you're doing something wacky