Any way to access function installed by makeActiveBinding?
With a bit of noodling around in envir.c, I can get this to work:
#include <Rcpp.h>using namespace Rcpp ;#define HASHSIZE(x) LENGTH(x)#define HASHVALUE(x) TRUELENGTH(x)// [[Rcpp::export]]SEXP get_binding_fun( std::string name, Environment env){ SEXP symbol = Rf_install( name.c_str() ); SEXP tab = HASHTAB(env) ; SEXP c = PRINTNAME(symbol); // finding the hash code for the symbol int hashcode = HASHVALUE(c) % HASHSIZE(tab); // get the value there from the hash table SEXP res = CAR( VECTOR_ELT(tab, hashcode ) ) ; return res ;}Save this into a .cpp file, sourceCpp it and use it with this R code:
> makeActiveBinding("x", function() runif(2), .GlobalEnv)> get_binding_fun("x", .GlobalEnv)# function ()# runif(2)