[Rcpp-devel] Unit Test Question Was: pnorm/qnorm?

[Dirk Eddelbuettel]

On 13 September 2012 at 08:56, Tim Triche, Jr. wrote:
| conclusion: Romain Francois is an absolute beast of a programmer
| 
| A stupid-ish question: how do ReferenceClasses map onto Rcpp objects?
| Have people done this?  Where can I look for examples?

I wish I had a better answer for this but here goes:

  - S3, S4, ReferenceClasses are all pure R constructs

  - Rcpp has some support for S4, S3 you can do on the fly (just set an
    attribute)

  - Rcpp modules creates you something that is a reference class

  - Besides Rcpp modules, we have beginnings of 'Rcpp classes' that allow you
    to extend C++ classes (brought in via Rcpp modules) on the R side; of
    course only the R side sees new members.
 
| Also, are other people who use Rcpp falling into the habit of using
| '=' instead of '<-' for assignment in R, so that moving code to C++
| goes more smoothly?

I am firmly in the 'Don't do '=' for assignment, ever' camp.

| Is there any real downside to this habit?  It came up at the BioC
| conference developer day this year and was more or less immediately
| dismissed.

Just say no.

Dirk
 
| Thanks all,
| 
| --t
| 
| 
| On Thu, Sep 13, 2012 at 6:24 AM, Dirk Eddelbuettel <edd at debian.org> wrote:
| >
| > On 13 September 2012 at 04:58, Christian Gunning wrote:
| > | On Wed, Sep 12, 2012 at 7:59 AM,
| > | <rcpp-devel-request at lists.r-forge.r-project.org> wrote:
| > | >
| > | > The "pixie dust" referred to your assertions that we "used some secret tools"
| > | > or "were hiding something".
| > | >
| > | > Neither one is true.  It's all there.  It's just damn hard to read. But it's
| > | > not hidden...
| > |
| > | I'm officially of the opinion the template code is isomorphic to magic
| > | pixie dust:  works, works well, don't really understand it.
| > | I've been meaning to ask, though... what's with the conspicuous lack
| > | of comments in the codebase?  Is this just a terse coding style?
| >
| > There are some comments in some places.  Generally speaking, not enough
| > though.  But if you to the sources and recurse through inst/include/ and src/
| > and count lines you end up with ... 60,000 lines.  That's a lot.
| >
| > And a good deal of it was written by Romain in a fairly short and insanely
| > productive period.  And on the margin I'd rather have working code than more
| > documentation and less code ...
| >
| > And we do have eight vignettes though (including the one you lead :-) so it's
| > not all lost.  And then again, if need to make a difference between
| > __interfaces__ which clearly documentation for users and __implementation__
| > which does need it less.
| >
| > Dirk
| >
| > --
| > Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
| > _______________________________________________
| > Rcpp-devel mailing list
| > Rcpp-devel at lists.r-forge.r-project.org
| > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
| 
| 
| 
| -- 
| A model is a lie that helps you see the truth.
| 
| Howard Skipper

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com