[Rcpp-devel] 64-bit ints on Windows 64-bit via size_t, unsigned long long, or unsigned __int64

[Bob Carpenter]

Jiqiang created a standalone example that illustrates
our problem with wrapping size_t into Rcpp on Win64.
The simple example is as follows (full running dump
from R/Rcpp below):

    size_t b = 100;
    Rcpp::List lst(a);
    lst["b"] = b;
    return lst;

We found this discussion:

http://stackoverflow.com/questions/8931123/return-wrap-of-size-t-in-rcpp

where Romain suggests just avoiding size_t and long long
altogether.  We're willing to fly in the face of all the
other advice we've ever gotten (which is to use "size_t" for
portability), but we don't know how to specify the type of
size_t in Win64 given that Romain doesn't want us to use
"size_t" or "unsigned long long".  Unfortunately, "unsigned long"
is only 32 bits on Windows.

I'm following Dirk's final comment on Stack Overflow
and "taking it to the [rcpp] list".

How should we specify the type of size_t in
Windows 64 bit given that we can't say "size_t" or "unsigned
long long"?  The only other option seems to be "unsigned __int64".
Here's the full table of types from the horse's mouth:

    http://msdn.microsoft.com/en-us/library/s3f49ktz(v=VS.80).aspx

- Bob Carpenter & Jiqiang Guo
   Columbia Uni., Dept. of Statistics


P.S.  Here's the full dump:

 > library(Rcpp)
 > library(inline)
 >
 > sessionInfo()
R version 2.15.1 (2012-06-22)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

other attached packages:
[1] inline_0.3.8 Rcpp_0.9.13
 >
 > src <- '
+   size_t b = 100;
+   Rcpp::List lst(a);
+   lst["b"] = b;
+   return lst;
+ '
 >
 > fx <- cxxfunction(signature(a = 'list'), body = src, includes = '',
+                   plugin = 'Rcpp', verbose = !TRUE)
In file included from C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/RcppCommon.h:326:0,
                  from C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp.h:27,
                  from file8c8759b1a9b.cpp:4:
C:/Program Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h: 
In function 'SEXPREC* 
Rcpp::internal::wrap_dispatch_unknown_iterable(const T&, 
Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]':
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:638:98: 
instantiated from 'SEXPREC* Rcpp::internal::wrap_dispatch_unknown(const 
T&, Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:654:96: 
instantiated from 'SEXPREC* Rcpp::internal::wrap_dispatch_eigen(const 
T&, Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:669:80: 
instantiated from 'SEXPREC* 
Rcpp::internal::wrap_dispatch_unknown_importable(const T&, 
Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:687:99: 
instantiated from 'SEXPREC* Rcpp::internal::wrap_dispatch(const T&, 
Rcpp::traits::wrap_type_unknown_tag) [with T = long long unsigned int, 
SEXP = SEXPREC*]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:791:104: 
instantiated from 'SEXPREC* Rcpp::wrap(const T&) [with T = long long 
unsigned int, SEXP = SEXPREC*]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/vector/proxy.h:155:4: 
instantiated from 'Rcpp::internal::generic_name_proxy<RTYPE>& 
Rcpp::internal::generic_name_proxy<RTYPE>::operator=(const T&) [with T = 
long long unsigned int, int RTYPE = 19, 
Rcpp::internal::generic_name_proxy<RTYPE> = 
Rcpp::internal::generic_name_proxy<19>]'
file8c8759b1a9b.cpp:33:14:   instantiated from here
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:433:11: 
error: invalid conversion from 'long long unsigned int' to 'SEXP' 
[-fpermissive]
make: *** [file8c8759b1a9b.o] Error 1

ERROR(s) during compilation: source code errors or compiler 
configuration errors!

Program source:
   1:
   2: // includes from the plugin
   3:
   4: #include <Rcpp.h>
   5:
   6:
   7: #ifndef BEGIN_RCPP
   8: #define BEGIN_RCPP
   9: #endif
  10:
  11: #ifndef END_RCPP
  12: #define END_RCPP
  13: #endif
  14:
  15: using namespace Rcpp;
  16:
  17:
  18: // user includes
  19:
  20:
  21: // declarations
  22: extern "C" {
  23: SEXP file8c8759b1a9b( SEXP a) ;
  24: }
  25:
  26: // definition
  27:
  28: SEXP file8c8759b1a9b( SEXP a ){
  29: BEGIN_RCPP
  30:
  31:   size_t b = 100;
  32:   Rcpp::List lst(a);
  33:   lst["b"] = b;
  34:   return lst;
  35:
  36: END_RCPP
  37: }
  38:
  39:
Error in compileCode(f, code, language = language, verbose = verbose) :
   Compilation ERROR, function(s)/method(s) not created! In file 
included from C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/RcppCommon.h:326:0,
                  from C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp.h:27,
                  from file8c8759b1a9b.cpp:4:
C:/Program Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h: 
In function 'SEXPREC* 
Rcpp::internal::wrap_dispatch_unknown_iterable(const T&, 
Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]':
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:638:98: 
instantiated from 'SEXPREC* Rcpp::internal::wrap_dispatch_unknown(const 
T&, Rcpp::traits::false_type) [with T = long long unsigned int, SEXP = 
SEXPREC*, Rcpp::traits::false_type = 
Rcpp::traits::integral_constant<bool, false>]'
C:/Program 
Files/R/R-2.15.1/library/Rcpp/include/Rcpp/internal/wrap.h:654:96: 
instantiated from 'SEXPREC* R
Calls: cxxfunction -> compileCode
In addition: Warning message:
running command 'C:/PROGRA~1/R/R-215~1.1/bin/x64/R CMD SHLIB 
file8c8759b1a9b.cpp 2> file8c8759b1a9b.cpp.err.txt' had status 1
Execution halted