[Rcpp-devel] Fwd: Wrapping copy constructor in rcpp?

[Tama Ma]

(Sorry that I forgot to cc to the list... Here is my message... I just came back from dinner...)

Begin forwarded message:

> From: Tama Ma <pingnang at phys.ethz.ch>
> Date: November 4, 2011 5:59:53 PM GMT+01:00
> To: Dirk Eddelbuettel <edd at debian.org>
> Subject: Re: [Rcpp-devel] Wrapping copy constructor in rcpp?
> 
> Dear  Dirk,
> 
> 	Yes, if  b = a.clone();   copies a into b.   
>        In the C++ language,  the following is what I mean:    
> 
> typedef <my/favourite/class>  object_type;
> 
> object_type a;
> object_type b(a);
> 
> 	Ultimately, what I desire in the R interface will be something like that:
> 
> a <-  new(my/favorite/Rcpp/Module , ... );
> b <-  new(my/favorite/Rcpp/Module , a);
> 
> 	But, if there exists such a clone() function that does the copying of Rcpp objects in the R interface, I am just as satisfied.
> 
> Best regards,
> Tama Ma
> 
> 
> 
> 
> 
> On Nov 4, 2011, at 5:51 PM, Dirk Eddelbuettel wrote:
> 
>> 
>> On 4 November 2011 at 17:08, Tama Ma wrote:
>> | Dear Dirk,
>> | 
>> | 	Thanks for the reply. I am pretty sure that it has not been implemented yet, and I will try to look into it. From a practical point of view, I would want to copy a "Rcpp" object in the R interface, and not a "copy-by-pointer" approach now. 
>> 
>> You mean just like what clone() does?
>> 
>> Dirk
>> 
>> | 	Thank you once again.
>> | 
>> | Best regards,
>> | Tama Ma
>> | 
>> | 
>> | On Nov 4, 2011, at 4:48 PM, Dirk Eddelbuettel wrote:
>> | 
>> | > 
>> | > On 4 November 2011 at 16:08, Tama Ma wrote:
>> | > | Dear Rcpp developers,
>> | > | 
>> | > | 	Maybe my previous email has been ignored. I am asking whether there is a possibility to wrap the copy constructor in a C++ class via Rcpp? 
>> | > 
>> | > You get a firm "maybe" and even an additional "why not" from me.
>> | > 
>> | > I am a little unsure exactly what you are after.  Basic Rcpp functions _all_
>> | > have to conform to the .Call()-required interface
>> | > 
>> | >     extern "C" SEXP foo(SEXP a, SEXP b)
>> | > 
>> | > signature (for a variable number of arguments). 
>> | > 
>> | > So no ctor or copy ctor here.  
>> | > 
>> | > So I presume you are talking about Rcpp Modules?  We have some documentation
>> | > on what is possible. If you don't see an explicit mention or example or unit
>> | > test doing it, then maybe it hasn't been implemented yet.  But this is Open
>> | > Source and you have already contributed a patch so you know the drill, right :)
>> | > 
>> | > Dirk
>> | > 
>> | > -- 
>> | > "Outside of a dog, a book is a man's best friend. Inside of a dog, it is too
>> | > dark to read." -- Groucho Marx
>> | > 
>> | 
>> | 
>> | Best regards,
>> | Tama Ma 
>> | (+41 78 640 50 15)
>> | 
>> | pingnang at phys.ethz.ch
>> | www.phys.ethz.ch/~pingnang
>> | 
>> | HIT K 31.3
>> | Institut für Theoretische Physik
>> | Wolfgang-Pauli-Strasse 27
>> | ETH Hönggerberg
>> | 8093 Zürich
>> | Switzerland
>> | 
>> 
>> -- 
>> "Outside of a dog, a book is a man's best friend. Inside of a dog, it is too
>> dark to read." -- Groucho Marx
>> 
> 
> 
> Best regards,
> Tama Ma 
> (+41 78 640 50 15)
> 
> pingnang at phys.ethz.ch
> www.phys.ethz.ch/~pingnang
> 
> HIT K 31.3
> Institut für Theoretische Physik
> Wolfgang-Pauli-Strasse 27
> ETH Hönggerberg
> 8093 Zürich
> Switzerland
> 


Best regards,
Tama Ma 
(+41 78 640 50 15)

pingnang at phys.ethz.ch
www.phys.ethz.ch/~pingnang

HIT K 31.3
Institut für Theoretische Physik
Wolfgang-Pauli-Strasse 27
ETH Hönggerberg
8093 Zürich
Switzerland

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