Date: Tue, 09 Jun 2015 13:24:47 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Poul-Henning Kamp <phk@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@FreeBSD.org>, Ian Lepore <ian@FreeBSD.org> Subject: Re: Make "sys/queue.h" usable with C++ Message-ID: <5576CCFF.5040608@selasky.org> In-Reply-To: <5576B7C4.2050707@selasky.org> References: <52D7D302.3090403@bitfrost.no> <1679.1389879981@critter.freebsd.dk> <52D7E674.4010501@bitfrost.no> <16417.1389881910@critter.freebsd.dk> <1389890913.1230.64.camel@revolution.hippie.lan> <52D8C268.1080009@bitfrost.no> <52D95A8E.3000006@freebsd.org> <55734622.5090808@selasky.org> <29842.1433755547@critter.freebsd.dk> <5576B7C4.2050707@selasky.org>
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On 06/09/15 11:54, Hans Petter Selasky wrote: > On 06/08/15 11:25, Poul-Henning Kamp wrote: >> It's really a decision if we want to spread dependence on typeof() >> to /usr/include isn't it ? > > Hi Paul-Henning, > > I'm aware about the typeof. Without typeof we would have to duplicate > more of the queue macros, because in C++ you can make lists with both > structs and classes. Else like some have suggested, we might drop the > class/struct keyword, but that again will not work in external C > sections in C++ files. > Hi Paul-Henning, From what I understand typeof() is a requirement for a C++ compiler while for C compilers not. I've update the patch to only use typeof for C++ where two different types can arise, and for C compilers keep the existing way in sys/queue.h. This also should make extern "C" code work assuming that if the C++ compiler supports typeof, it also works inside the extern "C". --HPS
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