Le 17/04/13 15:54, Dominique Belhachemi a écrit :
Hi everyone,
I am porting some code from the old API to the new API like in the
following example.
- SEXP ret = R_NilValue;
- RcppResultSet rs;
- rs.add("foo1", bar1);
- rs.add("foo2", bar2);
- ret = rs.getReturnList();
+ SEXP ret = R_NilValue;
+ ret = Rcpp::List::create(Rcpp::Named("foo1") = bar1
+ Rcpp::Named("foo2") = bar2);
This works well if I have less than 20 elements.
But how can I add new elements to the list, including assigning names ?
Is there an alternative way to create the list without using
Rcpp::List::create ?
Thanks
-Dominique
We don't have List::create above 20 elements. You can have a look at how
it is done for up to 20 and reproduce it locally.
You can do something like this "manually"
List out(25) ;
CharacterVector names(25) ;
for( int i=0; i<25; i++){
out[i] = ... ;
names[i] = ... ;
}
out.attr("names") = names ;
You can use a std::map<string,SomeType> if you deal with homogeneous types:
std::map<string,SomeType> map ;
map["foo"] = bar1 ;
map["foo2"] = bar2 ;
wrap( map ) ;
Or perhaps:
std::map<string,RObject> map ;
map["foo"] = wrap( bar1 ) ;
map["foo2"] = wrap( bar2 ) ;
wrap( map ) ;
Or perhaps even :
std::map<string,SEXP> map ;
map["foo"] = wrap( bar1 ) ;
map["foo2"] = wrap( bar2 ) ;
wrap( map ) ;
Romain
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