Re: [Dev-C++] #pragma directive

[Vlada D. <dj...@im...>]

Thanks for help. Good to know that.
----- Original Message -----
From: "Ioannis Vranos" <iv...@em...>
To: "'DevC++ help'" <dev...@li...>
Sent: Monday, June 16, 2003 1:09 PM
Subject: RE: [Dev-C++] #pragma directive


> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of Vlada Djurovic
> > Sent: Monday, June 16, 2003 11:52 AM
> > To: 'DevC++ help'
> > Subject: [Dev-C++] #pragma directive
> >
> >
> > In the book I'm currently reading, #pragma once directive is
> > used a lot to
> > make sure that no header files are included more than once.
> > When I compile
> > the program, I get warnings " #pragma once is obsolete". The book is
> > published this year, so I don't think it's too old.
> > I found another way for doing the same thing in Bruce Eckel's
> > "Thinking in
> > C++", like this:
>
>
> #pragmas are compiler dependend commands which are not portable. The
> standard says that when a #pragma directive is not recognised by the
> compiler it is ignored. So #pragma once is a directive recognised by MS
> compilers to include the header file only once.
>
>
> On the other hand the inclusion guard mechanism you are using below is
> portable and is what you should use (if you want your code to be
portable).
>
>
>
> >
> > #ifndef FLAG
> > #define FLAG
> > #includefoo.h  ///include needed headers
> > -------------
> > #endif
> >
> > Which way is better in your opinion? Or do you recommend
> > something else?
> > Thanks.
> > ------------
> > Vlada
>
>
>
>
>
> Ioannis Vranos
>
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>
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