Hello All, Im sure this question is basic but Im just getting started with R/c++ calls. I would like to use an standard template library (STL) map to organize some SEXP types in my program. The map is map<int, SEXP> paramMap. To insert values into the value portion of this map I make a call to the function getListElement (as defined on page 52 in Writing R Extensions). So the insert looks like: paramMap.insert(pair<int,SEXP>( some int, getListElement( some args ))); This statement is set in a for loop so that several map elements are inserted. On insert the return from getListElement is copied. My question is, do I need to somehow PROTECT the SEXP value portion of this map? Or this this not necessary? Thanks- Andy