add rmw_get_encoding_identifier

rmw_opensplice_cpp/CMakeLists.txt

@@ -52,6 +52,7 @@ add_library(rmw_opensplice_cpp SHARED
   src/rmw_client.cpp
   src/rmw_compare_gids_equal.cpp
   src/rmw_count.cpp
+  src/rmw_get_encoding_identifier.cpp
   src/rmw_get_gid_for_publisher.cpp
   src/rmw_get_implementation_identifier.cpp
   src/rmw_guard_condition.cpp

rmw_opensplice_cpp/src/identifier.cpp

@@ -15,3 +15,4 @@
 #include "identifier.hpp"
 
 const char * opensplice_cpp_identifier = "rmw_opensplice_cpp";
+const char * opensplice_cpp_encoding_identifier = "cdr";

rmw_opensplice_cpp/src/identifier.hpp

@@ -16,5 +16,6 @@
 #define IDENTIFIER_HPP_
 
 extern const char * opensplice_cpp_identifier;
+extern const char * opensplice_cpp_encoding_identifier;
 
 #endif  // IDENTIFIER_HPP_

rmw_opensplice_cpp/src/rmw_get_encoding_identifier.cpp

@@ -0,0 +1,27 @@
+// Copyright 2018 Open Source Robotics Foundation, Inc.
+//
+// Licensed 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.
+
+#include "rmw/rmw.h"
+
+#include "identifier.hpp"
+
+// The extern "C" here enforces that overloading is not used.
+extern "C"
+{
+const char *
+rmw_get_encoding_identifier()
+{
+  return opensplice_cpp_encoding_identifier;
+}
+}  // extern "C"