Re: [Rd] "warning: assignment discards qualifiers from pointer target type"

From: oliver <oliver_at_first.in-berlin.de>
Date: Thu, 09 Jun 2011 13:27:15 +0200

On Wed, Jun 08, 2011 at 08:35:34PM -0400, Simon Urbanek wrote:
>
> On Jun 8, 2011, at 8:32 PM, oliver wrote:
>
> > On Thu, Jun 09, 2011 at 02:17:31AM +0200, oliver wrote:
> > [...]
> >> OK, I looked at this now.
> >>
> >> LENGTH() checks the length of the vector.
> >>
> >> Good to know this.
> >>
> >> So the problem of a vector of length 0 can be with any arguments of type SEXP,
> >> hence I will need to check ANY arg on it's length.
> >>
> >> This is vital to stability under any situation.
> >>
> >> Thanks for this valuable hint!
> >>
> >> I will add checks for all my SEXP-args.
> > [...]
> >
> > Hey, LENGTH() does not work with String-vectors! :(
> >
>
> Of course it does ...
>
>

It does not so on my R 2.10.1 installation.

In the R-Shell I get:



  > length(c())
  [1] 0
  >

So c() is vec of length 0.

When I feed my readjpeg() with c() as filename arg,

testing with:



  if( LENGTH( filename_sexp ) < 1 )
  {
    error("LENGTH( filename_sexp ) < 1");     //error("filename can't be vector of length 0");   }
  else
  {
    error("LENGTH( filename_sexp ) is not < 1");   }

I got:
  Error in readjpeg(filename = c()) : LENGTH( filename_sexp ) is not < 1

You can explain why?

Ciao,

   Oliver



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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Thu 09 Jun 2011 - 11:31:04 GMT

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