[gameprogrammer] Re: creating a gui
- From: Olof Bjarnason <olof.bjarnason@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Wed, 7 Dec 2005 13:52:31 +0100
in your header file (.hpp, .hh or maybe .h):
//--------- GAMECLASS.HPP -----
#ifndef GAMECLASS_HPP
#define GAMECLASS_HPP
#include "mytypes.h" // or whatever type dependencies you have
// put your function prototypes, definitions, macros, class/struct
declarations here
// Note: NO definitions!
#endif
On 12/7/05, Roger D Vargas <luo_hei@xxxxxxxx> wrote:
>
> Yes, Im using C++. I was thinking about a singleton, but I m not
> experienced enough with advanced topics and when I try such things
> usually I end with a lot of weird errors.
>
> Bob Pendleton wrote:
> > On Tue, 2005-12-06 at 18:22 -0500, Roger D Vargas wrote:
> >
> >>Perhaps Im using the wrong method, but when I define a global variable
> >>in the header file I got a lot of errors concerning already defined
> >>symbol. I had that problem when moved the widget list outside a class.
> >>So I have to declare the variable as static, and that makes it accesible
> >>only to that file, I think.
> >
> >
> > What language are you using? In C/C++ if you put a variable declaration
> > in a header file it will be created in every source file that includes
> > the header file and that means you will have the same variable defined
> > in multiple places.
> >
> > You need to put it in the header file as an extern so that it is defined
> > but not declared in every file that uses the header file and then you
> > need to actually declare it in a single file. To get a better
> > understanding try searching on google for "extern C++ variable" (with
> > out the "s for obvious reasons).
> >
> > Also, if you are using C++ or other similar language you should look up
> > the "singleton" pattern for your language and use that. Using the
> > singleton pattern makes sure that there is one, and only one, copy of
> > the object in existence in your program.
> >
> > Bob Pendleton
> >
> >
> >>
> >>Olof Bjarnason wrote:
> >>
> >>>
> >>>On 12/6/05, *Bob Pendleton* <bob@xxxxxxxxxxxxx
> >>><mailto:bob@xxxxxxxxxxxxx>> wrote:
> >>>
> >>> On Tue, 2005-12-06 at 21:14 +0100, Olof Bjarnason wrote:
> >>> > If your not in a multi-threaded application, use a global
> >>> variable (or
> >>> > static member) pointing to the resource manager
> >>>
> >>> If it is multithreaded then do the same thing but use mutexes to
> >>> serialize access to the static object.
> >>>
> >>>
> >>>right! great that's the way.
> >>>
> >>>quite a lot of people (including myself) have heard so many times
> >>>"global variables are BAD BAD BAD" from "authorities" that we have a
> big
> >>>anxiety just thinking of global variables. maybe a combination of
> >>>pre-namespace-languages and hard-to-teach (and more serious problem)
> >>>concurrency?
> >>>
> >>> Bob Pendleton
> >>>
> >>> >
> >>> > On 12/6/05, Roger D Vargas < luo_hei@xxxxxxxx
> >>> <mailto:luo_hei@xxxxxxxx>> wrote:
> >>> > Im creating a widget set for my game and I have a big
> doubt
> >>> > when comes
> >>> > to implementing a theme.
> >>> > the theme manager class will contain all required
> >>> textures and
> >>> > data that
> >>> > will be used to draw elements. The problem is that I
> dont
> >>> know
> >>> > the right
> >>> > way to make the this class accesible to all widgets.
> >>> > Can somebody recommend me something?
> >>> >
> >>> > --
> >>> > Roger D. Vargas
> >>> > http://dsgp.blogspot.com | Linux, programación, juegos
> >>> >
> >>> >
> >>> >
> >>> > ______________________________________________
> >>> > Renovamos el Correo Yahoo!
> >>> > Nuevos servicios, más seguridad
> >>> > http://correo.yahoo.es
> >>> >
> >>> >
> >>> > ---------------------
> >>> > To unsubscribe go to
> >>> > http://gameprogrammer.com/mailinglist.html
> >>> >
> >>> >
> >>> >
> >>> --
> >>> +--------------------------------------+
> >>> + Bob Pendleton: writer and programmer +
> >>> + email: Bob@xxxxxxxxxxxxx <mailto:Bob@xxxxxxxxxxxxx> +
> >>> + web: www.GameProgrammer.com <http://www.GameProgrammer.com
> > +
> >>> + www.Wise2Food.com <http://www.Wise2Food.com> +
> >>> + nutrient info on 7,000+ common foods +
> >>> +--------------------------------------+
> >>>
> >>>
> >>>
> >>> ---------------------
> >>> To unsubscribe go to http://gameprogrammer.com/mailinglist.html
> >>>
> >>>
> >>>
> >>
>
> --
> Roger D. Vargas
> http://dsgp.blogspot.com | Linux, programación, juegos
>
>
> ______________________________________________
> Renovamos el Correo Yahoo!
> Nuevos servicios, más seguridad
> http://correo.yahoo.es
>
>
> ---------------------
> To unsubscribe go to http://gameprogrammer.com/mailinglist.html
>
>
>
Other related posts:
