|  | @@ -41,6 +41,8 @@ template <class ServiceType, class RequestType, class ResponseType>
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				|  |  |  class RpcMethodHandler;
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				|  |  |  template <class ServiceType, class RequestType, class ResponseType>
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				|  |  |  class ServerStreamingHandler;
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				|  |  | +template <StatusCode code>
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				|  |  | +class ErrorMethodHandler;
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				|  |  |  template <class R>
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				|  |  |  class DeserializeFuncType;
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				|  |  |  }  // namespace internal
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				|  | @@ -107,6 +109,8 @@ class ByteBuffer final {
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				|  |  |    friend class internal::RpcMethodHandler;
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				|  |  |    template <class ServiceType, class RequestType, class ResponseType>
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				|  |  |    friend class internal::ServerStreamingHandler;
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				|  |  | +  template <StatusCode code>
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				|  |  | +  friend class internal::ErrorMethodHandler;
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				|  |  |    template <class R>
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				|  |  |    friend class internal::DeserializeFuncType;
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				|  |  |  
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