On 10/12/18 7:21 PM, Dmitry Boyarintsev wrote: > On Fri, Oct 12, 2018 at 1:07 PM Sven Barth via fpc-devel > <fpc-devel@lists.freepascal.org <mailto:fpc-devel@lists.freepascal.org>> > wrote: > > Dmitry Boyarintsev <skalogryz.li...@gmail.com > <mailto:skalogryz.li...@gmail.com>> schrieb am Fr., 12. Okt. 2018, > 17:26: > > Maybe "Boolean8" type should help instead? > David, could you please test with Boolean8 instead of ByteBool? > > > Boolean8 is an alias to Boolean. But if you need to work with 1 and > 0, but have 4 Byte width then you could try Boolean32. > > > Hmm, this is odd. > https://www.freepascal.org/docs-html/ref/refsu4.html > Boolean8, size=1, ord=1 > "In addition to the simple Boolean type, the additional Boolean8, > Boolean16, Boolean32 and Boolean64 types exist. There are in fact > integer types, which are assignment-compatible with the simple boolean > type. As an integer, the values for True and False are 1 and 0. This can > be used to interfac with C code that defines a boolean of this size with > values 0 and 1." > > Boolean8 is not exactly an alias to Boolean, as it's expected to act as > an integer, rather than _Bool. (and would be expected? to be passed an > integer). > However, fpc 3.0.4 doesn't have Boolean8 as builtin type. Instead it > provides Boolean16+ only. Maybe it's available in trunk only.
All the Pascal Boolean types are not "Integer types". You can't assign any of them to a Integer or whatever without typecasting. They *all* behave like Boolean, because that was the way they were added. They are all 1-bit zero extended to the specified size. Look at the compiler sources, they are all implemented as pasboolSIZE, including Boolean. The documentation simply is *wrong* here. Compare this to the *Bool family of types that are 1-bit *sign*-extended to the specified size. Now for the problem at hand the question is either if the ABI is implemented incorrectly or that a new kind of Boolean type is required to correctly represent the _Bool type needed by Objective C. Regards, Sven _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
