NamesProxy const ness

Author: romainfrancois

inst/include/Rcpp/proxy/NamesProxy.h

@@ -64,12 +64,12 @@ class NamesProxyPolicy{
 
     class const_NamesProxy {
     public:
-        const_NamesProxy( CLASS& v) : parent(v){} ;
+        const_NamesProxy( const CLASS& v) : parent(v){} ;
 
         template <typename T> operator T() const ;
 
     private:
-        CLASS& parent; 
+        const CLASS& parent; 
 
         SEXP get() const {
             return RCPP_GET_NAMES(parent.get__()) ;