[fpc-pascal] libQT4Pas - Why it is needed?

[Krzysztof]

Just as I thought - it is object class thing. So if "FPC does not
(fully) support directly calling external C++ libraries" there are
plans to support it? This will be great

2012/1/29 Michael Van Canneyt <michael at freepascal.org>:
>
>
> On Sun, 29 Jan 2012, Krzysztof wrote:
>
>> Hi,
>>
>> I am wondering. If I build application for linux using gtk2 widgetset
>> for GNOME (or XFCE etc.) and send this program to my friend, then he
>> can run it without any external librarys (of course if he have gnome
>> too), this same thing on windows. But why when I build application on
>> KDE interface I need some external libQT4Pas to run it and my friend
>> need it too (he have KDE so all QT librarys too)? There is no
>> libGTK4Pas so why exists layer libQT4Pas? What is difference between
>> GTK and QT librarys?
>
>
> GTK has a procedural C interface, it is exposed in the GTK libraries. The
> FPC compiler understands this interface.
>
> Qt is written in C++, and exposes C++ classes in the Qt libraries. The FPC
> compiler does not know how to handle C++ classes.
> Therefor, a 'procedural' interface to the C++ needs to be made, and this is
> libQT4Pas. It is generated by a GCC.
>
> Michael.
>
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