Explicitly call abs as a function in DataFrame.h

Author: xhochy

ChangeLog

@@ -1,3 +1,7 @@
+2020-04-15 Uwe Korn <mail@uwekorn.com>
+
+	* inst/include/Rcpp/DataFrame.h: Explicit call to scalar std::abs
+
 2020-04-11  Dirk Eddelbuettel  <edd@debian.org>
 
 	* DESCRIPTION (Version, Date): Roll minor version

inst/include/Rcpp/DataFrame.h

@@ -79,7 +79,7 @@ namespace Rcpp{
             if (Rf_isNull(rn))
                 return 0;
             if (TYPEOF(rn) == INTSXP && LENGTH(rn) == 2 && INTEGER(rn)[0] == NA_INTEGER)
-                return abs(INTEGER(rn)[1]);
+                return std::abs(INTEGER(rn)[1]);
             return LENGTH(rn);
         }