Don't error when grouping zero-row data frames. Fixes tidyverse#486

wch · Jul 8, 2014 · a79ce47 · a79ce47
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commit a79ce47
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/inst/include/dplyr/Order.h b/inst/include/dplyr/Order.h
@@ -74,6 +74,7 @@ namespace dplyr {
     } ;
 
     inline Rcpp::IntegerVector OrderVisitors::apply() const {
+        if ( nrows == 0 ) return IntegerVector::create();
         IntegerVector x = seq(0, nrows -1 ) ;
         std::sort( x.begin(), x.end(), OrderVisitors_Compare(*this) ) ;
         return x ;