[Boost-users] intrusive_ptr and incomplete types 2

From: gast128 (gast128_at_[hidden])
Date: 2008-03-27 17:27:30

Peter Dimov <pdimov <at> pdimov.com> writes:

> 
> This doesn't answer your question, but if you add
> 
> void intrusive_ptr_add_ref( A* );
> void intrusive_ptr_release( A* );
> 
> you can copy intrusive_ptr<A> instances around freely. This achieves a level 
> of incomplete type support that matches shared_ptr<A>. 

I think this gives some linker error. In our code we often use a refcount base 
class, e.g:

class A : public RefCount
{
};

for the RefCount class has the functions are defined:

void intrusive_ptr_add_ref( RefCount* );
void intrusive_ptr_release( RefCount* );

and there is the problem: a fwd decl. is not enough for the compiler to figure 
out that a matches the RefCount functions.