Exposing Rcpp modules

Question

I am having some trouble working through the examples inside:

http://dirk.eddelbuettel.com/code/rcpp/Rcpp-modules.pdf

Specifically, section 2.2 where the author goes to expose a C++ class in RCPP and making it available to call in R.

I copied the code in to a new RCPP file and sourced it with no problem but got an error when I ran the following in R:

require(Rcpp)
require(inline)
unif_module <- Module( "unif_module", getDynLib(fx_unif ) )

The error:

Error in getDynLib(fx_unif) : 
  error in evaluating the argument 'x' in selecting a method for function 'getDynLib': Error: object 'fx_unif' not found

I then went though the other parts of the document where getDynLib is used and found that none of them initialized the arguments passed in to getDynLib. My question is what is fx_unif?

Thanks,

Update:

So following another example within the paper i tried:

inc = '
class Uniform {
public:
  Uniform(double min_, double max_) : min(min_), max(max_) {}
  NumericVector draw(int n) const {
    RNGScope scope;
    return runif( n, min, max );
  }
  double min, max;
};

double uniformRange( Uniform* w) {
  return w->max - w->min;
}
RCPP_MODULE(unif_module) {
  class_<Uniform>( "Uniform" )
  .constructor<double,double>()
  .field( "min", &Uniform::min )
  .field( "max", &Uniform::max )
  .method( "draw", &Uniform::draw )
  .method( "range", &uniformRange )
  ;
}
'

fx_unif = cxxfunction(signature(), plugin="Rcpp", include=inc)

error:

Error in compileCode(f, code, language = language, verbose = verbose) : 
  Compilation ERROR, function(s)/method(s) not created! Warning message:
running command 'make -f "C:/PROGRA~1/R/R-32~1.2/etc/x64/Makeconf" -f "C:/PROGRA~1/R/R-32~1.2/share/make/winshlib.mk" SHLIB_LDFLAGS='$(SHLIB_CXXLDFLAGS)' SHLIB_LD='$(SHLIB_CXXLD)' SHLIB="filef4028245a6f.dll" WIN=64 TCLBIN=64 OBJECTS="filef4028245a6f.o"' had status 127 
In addition: Warning message:
running command 'C:/PROGRA~1/R/R-32~1.2/bin/x64/R CMD SHLIB filef4028245a6f.cpp 2> filef4028245a6f.cpp.err.txt' had status 1