[Rcpp-devel] Regular Expressions

On 1 March 2013 at 23:03, Gabor Grothendieck wrote:
| On Fri, Mar 1, 2013 at 9:50 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
| >
| > On 1 March 2013 at 21:24, Hadley Wickham wrote:
| > | > | I searched BH for regex and found nothing so I don't think BH includes
| > | > | Boost.Regex.
| > | >
| > | > Could you register an issue ticket at the r-forge page for BH, please?  There
| > | > are other things missing too, of course, as we started pretty with the needs
| > | > of "just" bigmemory and RcppBDT.
| > |
| > | But Boost.Regex isn't header only?
| >
| > Yup. Found that out the hard way when I wrote it up as a piece for the Rcpp
| > Gallery. You do need to link.
| >
| > Piece now up at http://gallery.rcpp.org/articles/boost-regular-expressions/
| >
|
| I have downloaded boost such that I have this file:
|
| C:\MinGW\lib\libboost_regex.a
|
| How do I tell Rcpp to use it?

Follow eg the Rcpp Gallery story and use

    Sys.setenv("PKG_LIBS"="C:\MinGW\lib\libboost_regex.a")

as static library can be given "as is".  Else try

    Sys.setenv("PKG_LIBS"="-LC:\MinGW\lib\ -lboost_regex")

which is the standard form.  That should work with the example I posted.

If everthing else, try the documentation for Rcpp (Rcpp-package vignette in
particular) or Boost.

Thanks. I doubled each backslash but unfortunately neither work.

I am able to build the original credit_card_example from the boost
site independently of Rcpp, i.e. this builds and I can run the result:

   rem this works
   C:\MinGW\set_distor_paths.bat
   g++ credit_card_example.cpp -o credit_card_example.exe -lboost_regex

and can also build C++ scripts not using boost; however,

all of the following give:
credit.cpp:6:27: fatal error: boost/regex.hpp: No such file or directory

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="C:\\MinGW\\lib\\libboost_regex.a")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-LC:\\MinGW\\lib\\ -lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

I also tried with Cygwin.  I have this file among others:
C:\cygwin\lib\libboost_regex-mt.dll.a

and tried these but they give the same result:

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="C:\\cygwin\\lib\\libboost_regex-mt.dll.a")
   sourceCpp("credit.cpp", verbose = TRUE)

   library(Rcpp)
   Sys.setenv("PKG_LIBS"="-LC:\\cygwin\\lib\\ -lboost_regex")
   sourceCpp("credit.cpp", verbose = TRUE)

Changing backslash to forward slash does not change anything.

Everything was done with the svn version of Rcpp:

packageVersion("Rcpp")

[1] '0.10.2.5'