Add LwwRegister CRDT

blimp/helium/syncable_primitive_serializer.h

Index: blimp/helium/syncable_primitive_serializer.h
diff --git a/blimp/helium/syncable_primitive_serializer.h b/blimp/helium/syncable_primitive_serializer.h
new file mode 100644
index 0000000000000000000000000000000000000000..8f22a3b97e95b9aa36bf49e562470323c1097256
--- /dev/null
+++ b/blimp/helium/syncable_primitive_serializer.h
@@ -0,0 +1,44 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BLIMP_HELIUM_SYNCABLE_PRIMITIVE_SERIALIZER_H_
+#define BLIMP_HELIUM_SYNCABLE_PRIMITIVE_SERIALIZER_H_
+
+#include <string>
+
+#include "blimp/helium/blimp_helium_export.h"
+
+namespace google {
+namespace protobuf {
+namespace io {
+class CodedInputStream;
+class CodedOutputStream;
+}  // namespace io
+}  // namespace protobuf
+}  // namespace google
+
+namespace blimp {
+namespace helium {
+
+// Syncable CRDTs need to serialize their data into CodedOutputStreams. This
+// helper class centralizes that logic into two overloaded functions, one for
+// serialization and one for deserialization that can be called for any

[Kevin M, 2016/10/19 00:27:08]

"Any" doesn't seem accurate here, as we only support the types that are
explicitly called out here.

[steimel, 2016/10/19 16:40:50]

Done.

+// primitive type.
+class BLIMP_HELIUM_EXPORT SyncablePrimitiveSerializer {
+ public:
+  static void Serialize(const int32_t& value,
+                        google::protobuf::io::CodedOutputStream* output_stream);
+  static bool Deserialize(google::protobuf::io::CodedInputStream* input_stream,
+                          int32_t* value);
+
+  static void Serialize(const std::string& value,
+                        google::protobuf::io::CodedOutputStream* output_stream);
+  static bool Deserialize(google::protobuf::io::CodedInputStream* input_stream,
+                          std::string* value);
+};
+
+}  // namespace helium
+}  // namespace blimp
+
+#endif  // BLIMP_HELIUM_SYNCABLE_PRIMITIVE_SERIALIZER_H_