void check_not_groups(const LazyDots& dots, const GroupedDataFrame& gdf) {
int n = dots.size();
for (int i=0; i<n; i++) {
if (gdf.has_group(dots[i].name()))
stop("cannot modify grouping variable");
}
}
void check_not_groups(const CharacterVector& result_names, const GroupedDataFrame& gdf){
int n = result_names.size() ;
for( int i=0; i<n; i++){
if( gdf.has_group( result_names[i] ) )
stop( "cannot modify grouping variable" ) ;
}
}
void check_not_groups(const QuosureList& quosures, const GroupedDataFrame& gdf) {
int n = quosures.size();
for (int i = 0; i < n; i++) {
if (gdf.has_group(quosures[i].name()))
stop("cannot modify grouping variable");
}
}