|  | @@ -361,6 +361,12 @@ class Server::CallbackRequest final : public Server::CallbackRequestBase {
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				|  |  |    static_assert(std::is_base_of<ServerContext, ServerContextType>::value,
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				|  |  |                  "ServerContextType must be derived from ServerContext");
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				|  |  |  
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				|  |  | +  // The constructor needs to know the server for this callback request and its
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				|  |  | +  // index in the server's request count array to allow for proper dynamic
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				|  |  | +  // requesting of incoming RPCs. For codegen services, the values of method and
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				|  |  | +  // method_tag represent the defined characteristics of the method being
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				|  |  | +  // requested. For generic services, method and method_tag are nullptr since
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				|  |  | +  // these services don't have pre-defined methods or method registration tags.
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				|  |  |    CallbackRequest(Server* server, size_t method_idx,
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				|  |  |                    internal::RpcServiceMethod* method, void* method_tag)
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				|  |  |        : server_(server),
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