nested classes

**vaibhav** · 09-27-2005

Can I declare a nested class but define afterwords?

Code:

class a
{
public:
class b;
};

class a::b
{
};

I am getting error on doing this. Please suggest a way out if we can do this.

**CornedBee** · 09-27-2005

It is possible and part of the typical PIMPL pattern implementation.

What error do you get?

**Stoned_Coder** · 09-27-2005

its legal but some compilers dont like it.

**vaibhav** · 09-27-2005

error reads

Code:

multiple declaration of a::b

i am compiling it on turbo c++

**vaibhav** · 09-27-2005

sorry, i am not able to find it on faq

**CornedBee** · 09-27-2005

What version of Turbo C++?

**vaibhav** · 09-27-2005

I am using turbo c/c++ 3.0

**vaibhav** · 09-27-2005

error reads

Code:
multiple declaration of a::b

i am compiling it on turbo c++3.0

**CornedBee** · 09-27-2005

That's a horribly outdated compiler, known not to support any kind of nested classes.

Thread: nested classes