Le 2013-08-24 02:47, Dirk Eddelbuettel a écrit :
Hi,
On 23 August 2013 at 19:33, Subodh Acharya wrote:
| I am a beginner in Rcpp and I am very much enjoying the amazing
Rcpp and
| RcppArmadillo. It has really boosted my speed.
| I am making an R package that links to the RcppArmadillo to call
its new sample
| () function. I have several different functions ( defined in
separate .cpp
| files) that call the RcppArmadillo::sample().
| But whenever I call sample() in more than 1 file, I get the error
during
| package compilation. However, if I use the RcppArmadillo: sample()
in only one
| place and use R's sample() function, the package is compiled fine.
| Obviously, there is a multiple definition problem (from the
message) but I
| could not solve it. Any help will be highly appreciated.
That may be a problem at our end in the design of the contributed
sample.h
file. Someone recently noticed the same issue with sparse matrix
conversion
I had added in a similar fashsion; Romain has since cleaned this up
and moved
it into RcppArmadillo proper.
For now, your best (only?) bet may be to organize your code in such a
way
that sample.h gets included only once.
Sorry, Dirk
This is now fixed in svn.
The file did not have include guards and it was defining functions that
were too long to be inlined.
Since I don't want the user to have to link against an RcppArmadillo
library (like we do in Rcpp), I made these functions (SampleReplace, etc
...) templates.
This should allow people to include this file more than once.
The alternative would be to only have declarations of the
SampleReplace, etc ... functions in sample.h and definitions in a .cpp
file in RcppArmadillo, but then we would need users to mess with their
PKG_LIBS, and we would need to store a library we can link against. This
is already a lot of trouble to do this with Rcpp, so I'm not doing that
for RcppArmadillo.
The other alternative is to not host sample in RcppArmadillo but in
another package. I don't have strong opinion on this, but sample is
somewhat of an outlier in RcppArmadillo. RcppArmadillo is just supposed
to make armadillo available. sample is an example use case.
Romain
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