Bill,
R's R.h already has
typedef double Sfloat;
typedef int Sint;
#define SINT_MAX INT_MAX
#define SINT_MIN INT_MIN
for this purpose, and it is used in a lot of packages.
It goes back a long way, and I don't remember its origins but 'S
Programming' is one source.
Brian
On Wed, 4 Jun 2008, Bill Dunlap wrote:
We've been working on making it easier to write
packages that work in both R and Splus. One issue
is that R and Splus use different internal representations
of integers and this makes a difference on their 64-bit
versions: R uses ints (32 bits on 32-bit and 64-bit versions
of R) and Splus uses longs (32 bits on 32-bit Splus and
64 bits on 64-bit Splus). The obvious ways to deal with
the difference are to use a typedef or a #define to map
those to a common name. I think it would be handy to
put this definition into R.h or some other R header file
(Splus now has an R.h and other header files with the R
names that we recommend for all package work.)
Should this be a typedef or a #define? What should its
name be?
There is a file, RSCommon.h (from omegahat?), that I've seen
in a few packages which uses a typedef, RSInt, for this.
Repeated typedefs, even with the same definition, are illegal
so putting typedef ... RSInt into R.h would break those packages.
(C doesn't yet have an if-typedef-exists or untypedef construct,
does it?)
I like XXXinteger, since it refers to the R/Splus name of
the class, "integer", instead of the C-like name. Should
the "XXX" prefix be "RS" or "RSplus" or "S"?
I like typedefs since you can use them in the debugger.
Should a typedef be accompanied by a #define XXXinteger_defined
so one can write code that works on older versions of R or
Splus without the typedef?
I think R.h would be a good place for it, but I don't
have strong feeling about that one.
If we can come to a consensus on the name, typedef/#define,
and which *.h file, I can put it into Splus.
----------------------------------------------------------------------------
Bill Dunlap
Insightful Corporation
bill at insightful dot com
"All statements in this message represent the opinions of the author and do
not necessarily reflect Insightful Corporation policy or position."
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Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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