[Rcpp-devel] error while calling function in loop

[nandan amar]

Thanks Sean.
Its really helpful.

On 29 March 2011 00:00, Sean Robert McGuffee <sean.mcguffee at gmail.com>wrote:

>
> RInside R(argc, argv); //this would appear to be a class called RInside
> definining a variable called R initialized with argc and argv variables.
>
> To declare it globally, you would need to define it inside a *.cpp file
> once, and only once. Usually this is easiest to do at the top of a *.cpp
> file that uses it. Then do the same thing in other files that use it, but
> in
> those cases, place the term "extern" in front of the declaration.
>
> Example:
>
> RInside R; //this is a declaration
> extern RInside R; //this is a line for another file that lets the compiler
> know it is declared in another *.cpp file.
>
> Then inside your main function where you must be to get the argc and argv
> variables, you could then initialize the class:
> R=RInside(argc,argv);
>
> I haven't ever used this class, and my instructions assume that a default
> constructor for RInside is accessible to you. If it were not, then you
> would
> have to make a pointer to it in the global scope and then assign it by
> reference:
>
> //outside of all {}'s at the top of a *.cpp file:
> RInside *Rptr; //this is a pointer of type RInside declaration
> extern RInside *Rptr; //this is a line for another file that lets the
> compiler know Rptr is declared in another *.cpp file
>
> //inside main
> RInside R(argc, argv);
> Rptr=&R;
>
> I hope this helps,
>
> Sean
>
>
>
> On 3/26/11 10:18 AM, "Dirk Eddelbuettel" <edd at debian.org> wrote:
>
> >
> > On 26 March 2011 at 19:06, nandan amar wrote:
> > | Ohh Then i sud select reply to all
> > |
> > | Thanks Dirk,
> > | But RInside R(argc, argv) is not a variable .
> >
> > If R is not a variable here, what is it?
> >
> > | How can I declare it globally or share its instance.
> > | If it is not related to R/Rcpp please leave some related pointer.
> >
> > Sorry, but you simply need to read some more about C++ and or
> > programming. Google for 'good c++ book'. There is a free one I like at
> >
> >    http://www.icce.rug.nl/documents/cplusplus/
> >
> > which is also included in Debian and Ubuntu as a package.
> >
> > Dirk
>
>
>


-- 
Amar Kumar Nandan
Karnataka, India, 560100
http://aknandan.co.nr
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.r-forge.r-project.org/pipermail/rcpp-devel/attachments/20110329/8f8d18b1/attachment.htm>