initial R 📦 with travis setup and testthat suite, that links to arrow…

… c++ library and calls arrow::int32()

r/DESCRIPTION

@@ -2,7 +2,7 @@ Package: arrow
 Title: R Integration to 'Apache' 'Arrow'
 Version: 0.0.0.9000
 Authors@R: c(
-    person("Romain", "François", email = "romain@rstudio.com", role = c("aut", "cre")), 
+    person("Romain", "François", email = "romain@rstudio.com", role = c("aut", "cre")),
     person("Apache Arrow", email = "dev@arrow.apache.org", role = c("aut", "cph"))
   )
 Description: R Integration to 'Apache' 'Arrow'.
@@ -11,11 +11,11 @@ License: Apache License (>= 2.0)
 Encoding: UTF-8
 LazyData: true
 SystemRequirements: C++11
-LinkingTo: 
+LinkingTo:
     Rcpp
-Imports: 
+Imports:
     Rcpp
 Roxygen: list(markdown = TRUE)
 RoxygenNote: 6.0.1.9000
-Suggests: 
+Suggests:
     testthat

r/src/rrrow_types.h

@@ -0,0 +1,22 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#pragma once
+
+#include <Rcpp.h>
+#undef Free
+#include <arrow/api.h>