[Rd] Calling C++ from R

[mtck1982]

Hi All,

I am new to this area and use Rcpp to call C++ from R and try to build the
package under Windows 7. I use Rtools and R 2.10.1 32bit. Everything works
fine with me, except using R functions like "rnorm" or "runif" in the C++
code. When I use "R CMD check" the package, it always return error 

** libs
  making DLL ...
g++ -I"c:/PROGRA~2/R/R-210~1.1/include"  
-I"c:/PROGRA~2/R/R-210~1.1/library/Rcpp/include"     -O2 -Wall  -c func.cpp
-o func.o
func.cpp: In function 'SEXPREC* myfunction(SEXPREC*, SEXPREC*)':
func.cpp:220: error: 'rgamma' was not declared in this scope
func.cpp:225: error: 'rnorm' was not declared in this scope
func.cpp:244: error: 'runif' was not declared in this scope
func.cpp:274: error: 'rbeta' was not declared in this scope
make: *** [func.o] Error 1
  ... done

although I already put <Rmath.h>, <R.h> and <math.h> in the header file.
//////////////////////////////////////////////////
The func.cpp file has the following structure 

#include "func.h"
SEXP myfunction(SEXP a, SEXP b) {
}
//////////////////////////////////////////////
The  header file "func.h" has the following content

#include <cstdio>
#include <Rcpp.h>
#include <math.h>
#include <R.h>
#include <Rmath.h>
RcppExport SEXP myfunction(SEXP a, SEXP b);
/////////////////////////////////////////
What could the problem be?

Many thanks, 
Xiaochun
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