Re: [Boost-users] [asio] It pollutes my O-Zone!

Subject: Re: [Boost-users] [asio] It pollutes my O-Zone!
From: Robert Dailey (rcdailey_at_[hidden])
Date: 2009-08-25 13:20:33

The two significant lines are:
#include <boost/asio/io_service.hpp>
#include <wx/frame.h>

With the order they are in above, you will get a linker error:

Error 1 error LNK2001: unresolved external symbol "public: virtual class
wxClassInfo * __thiscall wxFrame::GetClassInfoA(void)const "
(?GetClassInfoA_at_wxFrame@@UBEPAVwxClassInfo@@XZ) MainFrame.obj

When you swap the order, it goes away.

---------
Robert Dailey

On Tue, Aug 25, 2009 at 12:11 PM, Jens Weller <JensWeller_at_[hidden]> wrote:

>
> > I noticed that <boost/asio.hpp> and <boost/asio/io_service.hpp> both
> > include
> > windows specific header files through some level of indirection. I know
> > this
> > because it is causing problems with wxWidgets depending on the order of
> my
> > include directives. I was considering using a mediator/pimpl of some sort
> > to
> > keep the asio includes limited to a very confined translation unit, but
> > this
> > would complicate the usage of ASIO in general. I have a class that owns
> an
> > io_service object by-value in its header.
> > Anyone have any suggestions to reduce the amount of namespace polluting
> > ASIO
> > does? I really blame this on the Windows API, since ASIO is just as
> > limited
> > by it as I am. Thanks in advance.
>
> I've just build an application with wxWidgets and asio this spring, and had
> no problems.
> I did use kind of the pattern in the chat example, but extended and more
> split up in Classes.
> Could you show the header code?
>
> regards
>
> Jens Weller
> --
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