Re: [Boost-users] [Interprocess] Trying to include unistd.h onWindows?

Subject: Re: [Boost-users] [Interprocess] Trying to include unistd.h onWindows?
From: Derek Kivi (derek.kivi_at_[hidden])
Date: 2009-03-02 11:29:07

> Derek Kivi wrote:
> > We are using the Interprocess library to make use of shared memory
> > within our code. We are experiencing the following problem when
building
> > on Windows.
> >
> > Some of our projects are trying to include unistd.h from
workaround.hpp.
> > It looks like this happens if BOOST_WINDOWS is not defined.
> >
> > Tracing back through the header files I pieced together that
> > BOOST_WINDOWS is not defined if BOOST_DISABLE_WIN32 is defined
> > (win32.hpp). And BOOST_DISABLE_WIN32 gets defined if _MSC_EXTENSIONS
is
> > not defined (visualc.hpp).
> >
> >>From the MSDN documentation, _MSC_EXTENSIONS is not defined if the
> > Visual C++ Language Extensions are turned off, which in fact they
are
> > for these projects.
> >
> > Has anyone else seen this and is there a workaround for getting
Boost
> > Interprocess to work on Windows in cases where the Visual C++
Language
> > Extensions are turned off?
> 
> sorry, for the really long delay. I've done some experiments and
> Interprocess can't be compiled without extensions because depends on
> Boost.DateTime which also needs them and because accesses to the
windows
> API (and __cdecl and similar extensions are used in winapi
declarations)
> require them. I haven't dedicated much time to this issue, but I have
> the impression that is not trivial to solve. Any help is appreciated.

Thanks Ion for looking into this. We have found a workaround for our
particular case.

In the past we have avoided this problem by having our class point to
another implementation class that then included the Boost headers. The
reason we weren't able to do that in this situation was that we were
trying to create a class that we wanted to put into shared memory, so
the use of pointers wouldn't work.

Our workaround was to create a char array member in our class, and then
in the cpp file for that class we used placement new to put a Boost
shared memory string "into" the char array space. Maybe not the nicest
code but it seems to work.

Thanks again,
Derek

-- 
Derek Kivi
Senior Software Developer
QuIC Financial Technologies Inc. 
Office: [phone] 
Mobile: [phone] 
derek.kivi_at_[hidden]
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