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Hi
How can I (can I?) forward declare a nested class without having
to define the class it is nested in? Like this

class A;
class A::B;
void f(A::B*);

Thanks in advance

Jiri Palecek
japeleck at web dot de

Jiri Palecek wrote:
> How can I (can I?) forward declare a nested class without having
> to define the class it is nested in?

You cannot.

"Jiri Palecek" <> wrote in message
news: om...
> Hi
> How can I (can I?) forward declare a nested class without having
> to define the class it is nested in? Like this
>
> class A;
> class A::B;
> void f(A::B*);
>
> Thanks in advance

One possible workaround is to define f to be a template

template<typename T>
void f(T*);

where f only relies on properties of T which A::B is known to satisfy.
If f(A::B) must coexist with other overloads of f(), you might be able
to use boost::enable_if.

Jonathan