From owner-freebsd-hackers@FreeBSD.ORG  Sat Jun  6 19:11:54 2015
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Date: Sat, 06 Jun 2015 21:12:34 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Julian Elischer <julian@freebsd.org>, Ian Lepore <ian@FreeBSD.org>, 
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Subject: Re: Make "sys/queue.h" usable with C++
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Hi,

I've come up with a smarter way to do it, which I think is more 
acceptable. Simply we need to duplicate the ENTRY and HEAD macros for 
use with classes. Then use __typeof() where pointers are referred inside 
these macros. That's it.

Can you checkout:

https://reviews.freebsd.org/D2745

And give some comments?

--HPS