type TfpgColor = type longword; means that you have a new type in the same *range* of longword. That means that you can assign the same number range, but if you have a variable that is a longword, and you wish to assigned the value to a TfpgColor, then you must cast it, or the compiler will tell you that it expect a TfpgColor content (unless there is a bug ;)).
Ido On Jan 30, 2008 11:30 AM, Graeme Geldenhuys <[EMAIL PROTECTED]> wrote: > Hi, > > Below is from the Kylix 3 help. > > --------------------------[ copy ]------------------------------ > Type identity is almost straightforward. When one type identifier is > declared using another type identifier, without qualification, they > denote the same type. Thus, given the declarations > type > T1 = Integer; > T2 = T1; > T3 = Integer; > T4 = T2; > > T1, T2, T3, T4, and Integer all denote the same type. To create > distinct types, repeat the word type in the declaration. For example, > type TMyInteger = type Integer;creates a new type called TMyInteger > which is not identical to Integer. > --------------------------[ end ]------------------------------ > > So when am I supposed to use > > type > TfpgColor = longword; > > vs > > type > TfpgColor = type longword; > > ??? > What's the actual difference between them? I have used the first > option (declaration) in the fpGUI project. For things like: > > const > clBlue = TfpgColor($0000FF); > > > Is the above the same as what the Free Pascal documentation describes > below? Or is this something different? > > --------------------------[ copy ]------------------------------ > The last class, type identifier, is just a means to give another name > to a type. This presents a way to make types platform independent, by > only using these types, and then defining these types for each > platform individually. The programmer that uses these units doesn't > have to worry about type size and so on. > --------------------------[ end ]------------------------------ > > > Regards, > - Graeme - > > > _______________________________________________ > fpGUI - a cross-platform Free Pascal GUI toolkit > http://opensoft.homeip.net/fpgui/ > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > -- http://ik.homelinux.org/ _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
