Prof Brian Ripley ripley@stats.ox.ac.uk
Sun, 7 Nov 1999 11:52:37 +0000 (GMT)

On Wed, 27 Oct 1999, Berwin Turlach wrote:

> may I request the following two changes to Rdefines.h (R 0.65.1)?
> 1.) Change line 106 from
>         #define Free(p)        R_chk_free( (void *)(p) )
> to
>         #define Free(p)        R_chk_free( (void *)(p) ) , p=NULL
> 2.)  Add after line 79:
> #define PROBLEM	{char R_problem_buf[R_PROBLEM_BUFSIZE];sprintf(R_problem_buf,
> a new line 80:
> #define PROBLEM	{char R_problem_buf[R_PROBLEM_BUFSIZE];sprintf(R_problem_buf,
> #define MESSAGE	{char R_problem_buf[R_PROBLEM_BUFSIZE];sprintf(R_problem_buf,
> The rationale behind both changes is to become more compatible with
> S.h from S-PLUS.  

Following discussions with Berwin I have adopted these (with a few extra
parentheses) for the R-devel version, although (Warning!) we discovered
that Free in S-PLUS 5.1 does not NULL the pointer, although S-PLUS 3.x
and 4.x do.  So truly portable code should not rely on this.

The exact nature of S.h is under re-consideration, as there are
considerable differences between S versions. My inclination is to use the 
best of S3 and S4 and provide definitions of the new macros that can be
used in S3 too, but undoubtedly back-compatibility will rear its head.

Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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