Dmitry Boyarintsev <skalogryz.li...@gmail.com> schrieb am Sa., 13. Okt. 2018, 01:57:
> On Fri, Oct 12, 2018 at 6:48 PM Sven Barth via fpc-devel < > fpc-devel@lists.freepascal.org> wrote: > >> Not quite: the Boolean16, Boolean32 and Boolean64 types were introduced >> because the libraries provided by GTK required a 4-Byte boolean type that >> worked like Object Pascal's Boolean. >> > That's interesting. > Let me ask a couple of things here: > > 1) gboolean is a size of int ( > https://www.gtk.org/api/2.6/glib/glib-Basic-Types.html#gboolean) > where FALSE is 0 and TRUE is not FALSE. > https://www.gtk.org/api/2.6/glib/glib-Standard-Macros.html#TRUE:CAPS > so, it's more -1, rather than 1 and it doesn't quite maps to Boolean > and/or Boolean32. It's matches to LongBool. > > var > b : Boolean; > lb : LongBool; > b32 : Boolean32; > begin > b := true; > lb := true; > b32 := true; > writeln(byte(b),' ',LongWord(b32),' ',LongWord(lb)); > writeln(ord(b),' ',Ord(b32),' ',Ord(lb)); > end. > Results in: > 1 1 4294967295 > 1 1 -1 > (matches documentation) > This was the reason they were added: https://bugs.freepascal.org/view.php?id=17400 > 2) why the were they named booleanN rather than gtkboolean or something? > (I'm referring to the suggestion of using objcbool name. It seem to fit) > They're an extension of the existing Boolean type with merely a different size, so why should they be named any differently? (in addition to what Michael wrote) > >> Then maybe it's an issue about the ABI (maybe all values with a size < 4 >> need to be correctly extended due to the ABI). >> > > I think Jonas clearly stated that ABI call works properly (to the word of > the specification) > The issues is that BOOL in objective-C is for Intel (macOS) is not _Bool > but rather a signed char. > > As of today, Pascal doesn't provide Boolean type that behaves like a > signed char in ABI terms. > (Boolean, and Boolean8 are size of _Bool which matched the size of signed > char, though treated are passed as "_Bool" following ABI rules) > Then maybe the type used to represent that BOOL should be a "type char" alias instead of using one of the build in Boolean types. Regards, Sven >
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