Re: [fpc-pascal]class variable
Great! But does -St also contain the parameters of -S2/-Sd? Or can we use them at them at the same time? "fpc -St -Sd aaa.pp"? > > Sorry that is wrong, static class members are supported, you need to > enable the static keyword using -St > > I don't know what you mean with class properties. > ___ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal]class variable
Hi, > Great! > But does -St also contain the parameters of -S2/-Sd? > Or can we use them at > them at the same time? "fpc -St -Sd aaa.pp"? Yes you can. Regards, Thomas ___ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal]class variable
On Friday 04 April 2003 07:48, you wrote: > > Hello! > > > >> Can any tell me if there's "Class Variable" in free pascal like in > >> java? > >> I mean, in java, you can declare a class memeber to be "static", all > >> instance of this class share the same variable memory. Such a member can > >> be > >> accessed through class name without any instantiation. > >> Does free pascal will add such a feature in the future? > > > > AFAIK, class variables are not supported yet, nor are class properties. > > But > > it's possible to use class methods, which in turn access a global > > variable. > > Sorry that is wrong, static class members are supported, you need to > enable the static keyword using -St > > I don't know what you mean with class properties. Sorry for my misinfo, but I didn't find anything about class variables in the docs (1.06), and I tried, in vain, to compile programs with class variables. I'm happy to learn that -St allows using class variables. It's a pity, though, that different keywords have to be used for class variables and class methods. By class properties, I mean properties that only access class members (class variables and class methods), and are accessible with the syntax: .. When trying class methods, I found that the executable behaves strange: Invoking a class method with . works fine. But, invoking the class method with . is accepted by the compiler, but results in an exception when is nil. Is that OK? thanks, anton tichawa. -- "Adas Methode war, wie sich zeigen wird, Tagträume in offenbar korrekte Berechnungen einzuweben." Doris Langley Moore: Ada, Countess of Lovelace (London 1977). -- Ing. Anton Tichawa Volkertstrasse 19 / 20 A-1020 Wien phone: +43 1 218 97 59 mobil: +43 664 52 07 907; currently n/a email: [EMAIL PROTECTED] -- ___ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal]class variable
> When trying class methods, I found that the executable behaves strange: > Invoking a class method with > > . > > works fine. But, invoking the class method with > > . > > is accepted by the compiler, but results in an exception when > is > nil. Is that OK? Please try it with 1.0.7 or 1.1. There are some changes regarding class methods since 1.0.6 ___ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal]class variable
On Fri, 4 Apr 2003, Anton Tichawa wrote: > On Friday 04 April 2003 07:48, you wrote: > > > Hello! > > > > > >> Can any tell me if there's "Class Variable" in free pascal like in > > >> java? > > >> I mean, in java, you can declare a class memeber to be "static", all > > >> instance of this class share the same variable memory. Such a member can > > >> be > > >> accessed through class name without any instantiation. > > >> Does free pascal will add such a feature in the future? > > > > > > AFAIK, class variables are not supported yet, nor are class properties. > > > But > > > it's possible to use class methods, which in turn access a global > > > variable. > > > > Sorry that is wrong, static class members are supported, you need to > > enable the static keyword using -St > > > > I don't know what you mean with class properties. > > Sorry for my misinfo, but I didn't find anything about class variables in the > docs (1.06), and I tried, in vain, to compile programs with class variables. I think peter was wrong. He meant class functions or methods. > I'm happy to learn that -St allows using class variables. It's a pity, > though, that different keywords have to be used for class variables and class > methods. > > By class properties, I mean properties that only access class members (class > variables and class methods), and are accessible with the syntax: > > .. > > When trying class methods, I found that the executable behaves strange: > Invoking a class method with > > . > > works fine. But, invoking the class method with > > . > > is accepted by the compiler, but results in an exception when is > nil. Is that OK? It depends on what you do in this method. It definitely works, because e.g. 'Classname' is a class method. The idea of a class variable is strange to me. Why not simply use a global variable ? Michael. ___ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
Re: [fpc-pascal]class variable
Hello!
> The idea of a class variable is strange to me.
> Why not simply use a global variable ?
In fact it would be a global variable, but one that is bound to a class, also
in the sense of a namespace.
Consider, as an example, a class variable that holds the count of instances.
Something like (this is pseudo code - it will not work that simple):
type t_myclass_a = class
class var instance_count: integer;
end;
type t_my_class_b = class
class var instance_count: integer;
end;
procedure list_instances(aclass: tclass);
begin
writeln('the class ' + aclass.classname + ' has ' +
intstr(aclass.instance_count) + ' instances');
// i. e. accessing the proper global variable for
// the given class type
end;
Type checking and inheritance of class variables still would have to be
considered.
Anton.
--
"Adas Methode war, wie sich zeigen wird, Tagträume in offenbar korrekte
Berechnungen einzuweben."
Doris Langley Moore: Ada, Countess of Lovelace (London 1977).
--
Ing. Anton Tichawa
Volkertstrasse 19 / 20
A-1020 Wien
phone: +43 1 218 97 59
mobil: +43 664 52 07 907; currently n/a
email: [EMAIL PROTECTED]
--
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[fpc-pascal]OpenGL/GLUT run time error when I whant compile this code
Hello
I played around with the OpenGL unit, and I wrote some minimal OpenGL code to get a
window:
Here is the code:
program glbasic;
uses
gl, glut;
const
width = 640;
height= 480;
procedure drawthings;
begin
glClearColor(0.0, 0.0, 0.0, 0.0);
(*will add some more code*);
end;
begin
glutInit(@argc, argv);
glutInitDisplayMode(GLUT_DOUBLE or GLUT_RGB);
glutInitWindowSize( width, height);
glutInitWindowPosition(0, 0);
glutCreateWindow('glbasic');
glutDisplayFunc(@drawthings);
glutMainLoop();
end.
Now, when I whant to run to code, I get some Run time errors on the console:
Runtime error 216 at 0x4052F5CA
0x4051F5CA
Runtime error 216 at 0x0804C1CA
0x0849C1CA
0x0805127E
etc.
etc.
etc. (about 20 lines)
1). I know not a lot of runtime errors, but after succesfully compiling, that isn`t a
fpc bug, is it ?
What is the source of this run time error ? (mesa, fpc or my code ?)
2). I think about there isn`t enough code in the drawthings procedure to run
succesfull.
What you think ?
Greetings
Karim F.
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Re: [fpc-pascal]OpenGL/GLUT run time error when I whant compile this code
On Sat, Apr 05, 2003 at 10:02:07AM +0800, Karim Forsthofer wrote:
> Hello
> I played around with the OpenGL unit, and I wrote some minimal OpenGL code to get a
> window:
> Here is the code:
>
> program glbasic;
>
> uses
> gl, glut;
>
> const
> width = 640;
> height= 480;
>
> procedure drawthings;
>
> begin
> glClearColor(0.0, 0.0, 0.0, 0.0);
> (*will add some more code*);
> end;
>
> begin
> glutInit(@argc, argv);
> glutInitDisplayMode(GLUT_DOUBLE or GLUT_RGB);
> glutInitWindowSize( width, height);
> glutInitWindowPosition(0, 0);
> glutCreateWindow('glbasic');
> glutDisplayFunc(@drawthings);
> glutMainLoop();
> end.
>
> Now, when I whant to run to code, I get some Run time errors on the console:
>
> Runtime error 216 at 0x4052F5CA
>0x4051F5CA
> Runtime error 216 at 0x0804C1CA
>0x0849C1CA
>0x0805127E
>
>etc.
>etc.
>etc. (about 20 lines)
>
> 1). I know not a lot of runtime errors, but after succesfully compiling, that isn`t
> a fpc bug, is it ?
> What is the source of this run time error ? (mesa, fpc or my code ?)
> 2). I think about there isn`t enough code in the drawthings procedure to run
> succesfull.
>
> What you think ?
That piece of code runs fine on my machine, except that my display
doesn't support OpenGL GLX Extension :( hehe, need to compile my nvidia
kernel drivers...
cheer
sJames
>
> Greetings
> Karim F.
>
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