[Rcpp-devel] FW: Rcpp attributes.cpp issue

[Kevin Ushey]

IIUC, from the build errors you're seeing, the compiler can't decide if it
should convert `0U` (unsigned int) to an `unsigned long` or a `char*` (e.g.
as a null pointer). In other words, these two overloads are competing:

   void insert (iterator p, size_t n, char c);

string& insert (size_t pos, size_t n, char c);


Most other standard library implementations have 'iterator' as a completely
separate type from a plain `char*` pointer, to avoid things like this
(since 0 can implicitly be converted to a pointer).

To work around this (on Rcpp's side) I think we could cast `0` to a
`std::size_t` in each call, or else perform what is essentially a
'push_front' in a separate way.

Kevin

On Sat, Apr 18, 2015 at 7:02 PM, Latchezar (Lucho) Dimitrov <
ldimitro at wakehealth.edu> wrote:

> OK. Here it is.
>
> Hi All,
>
> Please see bellow my original e-mail to Mr. Eddelbuettel.
>
> Help anyone? I do not need necessarily a Solaris user, rather someone who
> knows the actual types of 0U bellow or another way to resolve the ambiguity.
>
> Thanks a lot,
> Latchezar
>
> "
> Dear Mr. Eddelbuettel,
>
> I have just built R-3.1.2 on solaris 11.2 with solaris stufio 12.4. Then
> starting it from the build I tried to install Rcpp. I failed due to the
> following compilation errors:
>
> "attributes.cpp", line 1369: Error: Overloading ambiguity between
> "std::string::insert(char*, unsigned long, char)" and
> "std::string::insert(unsigned long, unsigned long, char)".
> "attributes.cpp", line 1378: Error: Overloading ambiguity between
> "std::string::insert(char*, unsigned long, char)" and
> "std::string::insert(unsigned long, unsigned long, char)".
>
> The lines in the code are:
>
>                         typeText.insert(0U, 1U, *it);
> and
>                 name.insert(0U, 1U, ch);
>
> Apparently I have to specify the type of 0U argument. Would you please
> help?
>
> Thanks a lot,
>
> Latchezar Dimitrov,
> Analyst/Programmer, Wake Forest Univ. School of Medicine,
> Winston-Salem, NC
> U.S.A.
> "
>
>
>
>
> -----Original Message-----
> From: Dirk Eddelbuettel [mailto:edd at debian.org]
> Sent: Saturday, April 18, 2015 10:15 AM
> To: Latchezar (Lucho) Dimitrov
> Cc: edd at debian.org
> Subject: Re: Rcpp attributes.cpp issue
>
>
> I'd prefer the question on rcpp-devel. You may find a Solaris user there.
>
> Dirk
>
>
> Thank you for your email concerning Rcpp.
>
> Due to the number of emails I receive about Rcpp, I can no longer respond
> to each incoming email individually.  However, documentation is available
> via:
>
>   eight pdf "vignette" files which are included in the package, among them
> a
>   FAQ and an introduction to Rcpp
>
>   the introductory vignette is also published in the Journal of Statistical
>   Software (http://www.jstatsoft.org/v40/i08/)
>
>   my book at Springer (see http://www.rcpp.org/book) released in June 2013
>
>   about 80 examples published in the Rcpp Gallery (http://gallery.rcpp.org
> )
>
>   numerous answers on the rcpp-devel mailing list
>   (http://lists.r-forge.r-project.org/mailman/listinfo/rcpp-devel) and
> you are
>   invited to ask on the list (but need to subscribe first)
>
>   numerous posts on the StackOverflow site under the 'rcpp' tag
>   (http://stackoverflow.com/questions/tagged/rcpp) and you are invited to
> ask
>   there as well (though the rcpp-devel list may still get better answers)
>
>   posts on my blog (http://dirk.eddelbuettel.com/blog)
>
>   the code archive itself at GitHub https://github.com/RcppCore/Rcpp and
> the
>   package itself on CRAN (
> http://cran.r-project.org/web/packages/Rcpp/index.html),
>   in particular the unitTest examples can be instructive
>
>   the over 320 packages on CRAN (and 41 more on BioConductor) using Rcpp
>
> Additionally, the introductory vignettes for RcppArmadillo and RcppEigen
> have now been published as well (
> http://dx.doi.org/10.1016/j.csda.2013.02.005;
> http://www.jstatsoft.org/v52/i05/)
>
> In particular, the  rcpp-devel  mailing list is the perfect place for
> questions (but please register in order to post, a measure required to keep
> spammers away).
>
> Sincerely,  Dirk Eddelbuettel
>
> --
> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>
> _______________________________________________
> 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
>
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