compiles!
diff --git a/src/cpp/codegen/core_codegen.h b/src/cpp/codegen/core_codegen.h
new file mode 100644
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--- /dev/null
+++ b/src/cpp/codegen/core_codegen.h
@@ -0,0 +1,70 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc++/impl/codegen/core_codegen_interface.h>
+#include <grpc/impl/codegen/grpc_types.h>
+#include <grpc/byte_buffer.h>
+
+namespace grpc {
+
+class CoreCodegen : public CoreCodegenInterface {
+ private:
+ grpc_completion_queue* grpc_completion_queue_create(void* reserved) override;
+
+ void grpc_completion_queue_destroy(grpc_completion_queue* cq) override;
+
+ grpc_event grpc_completion_queue_pluck(grpc_completion_queue* cq, void* tag,
+ gpr_timespec deadline,
+ void* reserved) override;
+
+ void* gpr_malloc(size_t size) override;
+
+ void gpr_free(void* p) override;
+
+ void grpc_byte_buffer_destroy(grpc_byte_buffer* bb) override;
+
+ void grpc_metadata_array_init(grpc_metadata_array* array) override;
+
+ void grpc_metadata_array_destroy(grpc_metadata_array* array) override;
+
+ void assert_fail(const char* failed_assertion) override;
+
+ Status SerializeProto(const grpc::protobuf::Message& msg,
+ grpc_byte_buffer** bp) override;
+
+ Status DeserializeProto(grpc_byte_buffer* buffer,
+ grpc::protobuf::Message* msg,
+ int max_message_size) override;
+};
+
+} // namespace grpc