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From: David Chisnall <theraven@FreeBSD.org>
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Date: Fri, 30 Dec 2011 17:45:13 +0000
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To: "Sean C. Farley" <scf@FreeBSD.org>
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Subject: Re: svn commit: r228878 - head/include
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On 30 Dec 2011, at 16:52, Sean C. Farley wrote:

>> My quick googling didn't show anything at all about the C++ standard =
and stdbool.h or __bool_true_false_are_defined.  It was probably =
originally set because bool, true, and false are all C++ keywords so =
certain code that wanted to ifdef on them didn't also need to check =
__cplusplus.
>=20
> I did not find anything definitive either.

It's usually a better idea to check the spec than Google...

stdbool.h is not part of the C++ standard, and so it is free to contain =
anything in C++ mode, just as any other non-standard header is.  The =
<cstdbool> header is defined by the C++11 spec as containing JUST the =
__bool_true_false_are_defined macro.  The purpose of this header in C++ =
mode is to allow the inclusion of C++ headers that expect to be able to =
use true and false and guard this by the use of the =
__bool_true_false_are_defined macro.

David=